SPA2102 T38 Howto

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Contents

Firmware

Latest release apparently buggy (5.2.12). Get version 5.2.10 instead. Read that as T38 DOES NOT WORK on 5.2.12. Comment: I am using latest 5.2.13(004) which has no problem at all. Read the release note of 5.2.12 which fixed a few bugs 5.2.10. One of them I consider major.

Configure SPA2102

Provider and registration as per usual. watch the 0.030 bug on the RTP Packet size (login advanced)

  • Voice -> SIP
    • RTP Packet Size: 0.020
  • Voice -> Line 1 [or 2]
Preferred Codec G711u Second Preferred Codec G711u
Third Preferred Codec G711u Use Pref Codec Only yes
Silence Supp Enable no Silence Threshold medium
G729a Enable yes Echo Canc Enable no
G723 Enable yes Echo Canc Adapt Enable no
G726-16 Enable yes Echo Supp Enable no
G726-24 Enable yes FAX CED Detect Enable yes
G726-32 Enable yes FAX CNG Detect Enable yes
G726-40 Enable yes FAX Passthru Codec G711u
DTMF Process INFO yes FAX Codec Symmetric yes
DTMF Process AVT Yes FAX Passthru Method ReINVITE
DTMF Tx Method Auto DTMF Tx Mode Strict
DTMF Tx Strict Hold Off Time 90 FAX Process NSE yes
Hook Flash Tx Method None FAX Disable ECAN yes
Release Unused Codec yes FAX Enable T38 yes
FAX T38 Redundancy 1 FAX Tone Detect Mode caller or callee


In addition to above, you will want to use the following settings:

On the Same Line Tab:

  • Network Jitter Buffer: very high
  • Jitter buffer adjustment: disable
  • Call Waiting: no
  • 3 Way Calling: no
  • Echo Canceller: no
  • Silence Suppression: no
  • Preferred Codec: G.711
  • Use Pref. codec Only: Yes

Without the above settings, outbound fax would work (in proxy media mode) some of the time, but T38 negotioation would fail sometimes and never go through. One example was HP's faxback service: 1-888-hpfaxme (1-888-473-2963).

Configure Fax Machine

You'll also need to set your Fax machine to a max speed of 14.4k and a min speed of 7200.

SPA2102 SYSLOG

This was to a fax extension received by spandsp. It's what we should see on the device when it does t38 (assuming you configured the syslog server) 

Jan 18 10:37:19 sipuraspa [0]FM 00000020 Tx      T38: i.no_signal
Jan 18 10:37:19 T38 Decode UDPTL error
Jan 18 10:37:19 sipuraspa T38: duplicate packet(s) received seq=0
Jan 18 10:37:19 sipuraspa [0]FM 00000060 Rx      T38: i.no_signal
Jan 18 10:37:19 sipuraspa T38: duplicate packet(s) received seq=1
Jan 18 10:37:19 sipuraspa [0]FM 00000280 Rx      T38: i.ced
Jan 18 10:37:22 sipuraspa T38: duplicate packet(s) received seq=2
Jan 18 10:37:22 sipuraspa [0]FM 00003300 Rx      T38: i.no_signal
Jan 18 10:37:22 sipuraspa T38: duplicate packet(s) received seq=3
Jan 18 10:37:22 sipuraspa [0]FM 00003370 Rx      T38: i.v21_preamble
Jan 18 10:37:23 sipuraspa [0]FM 00004380 Rx      T38: d.v21 . . .
Jan 18 10:37:24 sipuraspa [0]FM 00005000 Rx      T38: d.hdlc_fcs_OK
Jan 18 10:37:24 sipuraspa [0]FM 00005020 Mod CSI Frame [25]:  ff 03 40 2d 20 43                                                                                                                                4c 4c 20 6f 6c 61 48 20 73 75 72 61 74 6c 6f 43 20 ac f4
Jan 18 10:37:24 sipuraspa [0]FM 00005120 Rx      T38: d.v21 . . .
Jan 18 10:37:24 sipuraspa T38: duplicate packet(s) received seq=41


FS Dialplan

Providers

It seems to make a difference here, and I'm not sure why.

  • UnivoIP: Likes the T38 Gateway Peer.
  • Flowroute: Likes the Just Bridge Method. Never got a fax complete with either T38_Gateway method.
    • UPDATE Faxes still would not go out very reliably. Using Proxy Media method seems to have fixed it.
  • GrnVoIP: Doesn't seem to like anything. Also notable, currently (2012/01/18) they do not allow toll free t38 faxing.

Proxy Media

This has worked the best so far for me. Everything else does not seem to work so well. 

<extension name="00-Fax-7d" >
  <condition field="${user_name}" expression="^103[0-9]" />
  <condition field="destination_number" expression="^(\d{7})$" >
    <action application="set" data="sip_h_X-accountcode=${accountcode}" />
    <action application="set" data="call_direction=outbound" />
    <action application="set" data="hangup_after_bridge=true" />
    <action application="set" data="effective_caller_id_name=${outbound_caller_id_name}" />
    <action application="set" data="effective_caller_id_number=${outbound_caller_id_number}" />
    <action application="set" data="proxy_media=true" />
    <action application="bridge" data="sofia/gateway/flowroute/1361$1" />
  </condition>
</extension>

Just Bridge

Tried effectively no dialplan, just bridge. This works, but T38 only ends up on the b-leg. 

<extension name="00_Fax" >
   <condition field="${user_name}" expression="^103[0-9]" />
   <condition field="destination_number" expression="^(\d{10})$" >
       <action application="set" data="sip_h_X-accountcode=${accountcode}" />
       <action application="set" data="call_direction=outbound" />
       <action application="set" data="hangup_after_bridge=true" />
       <action application="set" data="effective_caller_id_name=${outbound_caller_id_name}" />
       <action application="set" data="effective_caller_id_number=${outbound_caller_id_number}" />
       <action application="bridge" data="sofia/gateway/flowroute/1$1" />
   </condition>
</extension>

t38_gateway mode

Self

Outbound faxes just fail. T38 does does get hit on the spa2102 and the provider, but they rarely go through. 

<extension name="00_Fax1" >
   <condition field="${user_name}" expression="^103[0-9]" />
   <condition field="destination_number" expression="^(\d{10})$" >
       <action application="set" data="sip_h_X-accountcode=${accountcode}" />
       <action application="set" data="call_direction=outbound" />
       <action application="set" data="hangup_after_bridge=true" />
       <action application="set" data="effective_caller_id_name=${outbound_caller_id_name}" />
       <action application="set" data="effective_caller_id_number=${outbound_caller_id_number}" />
       <action application="set" data="inherit_codec=true" />
       <action application="set" data="fax_enable_t38=true" />
       <action application="set" data="fax_enable_t38_request=true" />
       <action application="set" data="execute_on_answer=t38_gateway self" />
       <action application="bridge" data="sofia/gateway/univoip.ca/1$1" />
       <action application="bridge" data="sofia/gateway/grnVoIP-T38/account1$1" />
       <action application="bridge" data="{absolute_codec_string=PCMU}sofia/gateway/univoip.ca/1$1" />
   </condition>
</extension>

Peer

Outbound faxes. This with above SPA2102 config seems to be the magic ticket. 

<extension name="00_Fax1" >
   <condition field="${user_name}" expression="^103[0-9]" />
   <condition field="destination_number" expression="^(\d{10})$" >
       <action application="set" data="sip_h_X-accountcode=${accountcode}" />
       <action application="set" data="call_direction=outbound" />
       <action application="set" data="hangup_after_bridge=true" />
       <action application="set" data="effective_caller_id_name=${outbound_caller_id_name}" />
       <action application="set" data="effective_caller_id_number=${outbound_caller_id_number}" />
       <action application="set" data="inherit_codec=true" />
       <action application="set" data="fax_enable_t38=true" />
       <action application="set" data="fax_enable_t38_request=true" />
       <action application="set" data="execute_on_answer=t38_gateway peer" />
       <action application="bridge" data="sofia/gateway/univoip.ca/1$1" />
       <action application="bridge" data="sofia/gateway/grnVoIP-T38/account1$1" />
       <action application="bridge" data="{absolute_codec_string=PCMU}sofia/gateway/univoip.ca/1$1" />
   </condition>
</extension>
Relevant SPA2102 Log
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 91 96
Jan 18 12:56:43 sipuraspa [0]FM 00001500 Tx      T38: d.hdlc_fcs_OK
Jan 18 12:56:43 sipuraspa [0]FM 00001660 Tx      T38: d.v21 . . .
Jan 18 12:56:43 sipuraspa [0]FM 00001840     DCS: 0.5.0.2.0.0.0.1  v17_14400
Jan 18 12:56:43 sipuraspa [0]FM 00001840 Dem DCS Frame [11]:  ff 13 83 00 a2 98 80 80 00 76 85
Jan 18 12:56:43 sipuraspa [0]FM 00001860 Tx      T38: d.hdlc_fcs_OK_sig_end
Jan 18 12:56:43 sipuraspa [0]FM 00001880 Tx      T38: i.no_signal
Jan 18 12:56:43 sipuraspa [0]FM 00001890 Dem     Modulation v17_14400_long_training
Jan 18 12:56:43 sipuraspa [0]FM 00001900 Tx      T38: i.v17_14400_long_training
Jan 18 12:56:45 sipuraspa [0]FM 00003540 Tx      T38: d.v17_14400 . . .
Jan 18 12:56:46 sipuraspa [0]FM 00004920         Z:2420
Jan 18 12:56:46 sipuraspa [0]FM 00005070 Dem     Tf=  -2882, Cf=   -226, Ag=   1155, Qc=  0, Di=  0, Do=  0
Jan 18 12:56:46 sipuraspa [0]FM 00005080 Tx      T38: d.t4_non_ecm_sig_end
Jan 18 12:56:46 sipuraspa [0]FM 00005100 Tx      T38: i.no_signal
Jan 18 12:56:47 sipuraspa T38: duplicate packet(s) received seq=1
Jan 18 12:56:47 sipuraspa [0]FM 00005840 Rx      T38: i.v21_preamble
Jan 18 12:56:48 sipuraspa [0]FM 00006800 Rx      T38: d.v21 . . .
Jan 18 12:56:48 sipuraspa [0]FM 00006880 Rx      T38: d.hdlc_fcs_OK
Jan 18 12:56:48 sipuraspa T38: duplicate packet(s) received seq=6
Jan 18 12:56:48 sipuraspa T38: duplicate packet(s) received seq=7
Jan 18 12:56:48 sipuraspa [0]FM 00006900 Rx      T38: d.hdlc_sig_end
Jan 18 12:56:48 sipuraspa [0]FM 00006900 Rx      T38: i.no_signal
Jan 18 12:56:48 sipuraspa [0]FM 00006930 Mod CFR Frame [ 5]:  ff 13 84 ea 7d
Jan 18 12:56:48 sipuraspa [0]FM 00007300 Dem     Modulation v17_14400_short_training
Jan 18 12:56:49 sipuraspa [0]RegOK. NextReg in 3570 (1)
Jan 18 12:56:49 sipuraspa [0]FM 00008320 Tx      T38: i.v17_14400_short_training
Jan 18 12:56:49 sipuraspa [0]FM 00008340 Tx      T38: d.v17_14400 . . .
Jan 18 12:57:07 sipuraspa [0]FM 00025550 Dem     Tf=  -4115, Cf=   -227, Ag=   1071, Qc=  0, Di=  0, Do=  0
Jan 18 12:57:07 sipuraspa [0]FM 00025580 Tx      T38: d.t4_non_ecm_sig_end
Jan 18 12:57:07 sipuraspa [0]FM 00025600 Tx      T38: i.no_signal
Jan 18 12:57:07 sipuraspa [0]FM 00025780 Tx      T38: i.v21_preamble
Jan 18 12:57:08 sipuraspa [0]FM 00026720 Tx      T38: d.v21 . . .
Jan 18 12:57:08 sipuraspa [0]FM 00026740 Dem EOP Frame [ 5]:  ff 13 2f 33 66
Jan 18 12:57:08 sipuraspa [0]FM 00026760 Tx      T38: d.hdlc_fcs_OK_sig_end
Jan 18 12:57:08 sipuraspa [0]FM 00026780 Tx      T38: i.no_signal
Jan 18 12:57:09 sipuraspa T38: duplicate packet(s) received seq=8
Jan 18 12:57:09 sipuraspa [0]FM 00027600 Rx      T38: i.v21_preamble
Jan 18 12:57:10 sipuraspa [0]FM 00028580 Rx      T38: d.v21 . . .
Jan 18 12:57:10 sipuraspa T38: duplicate packet(s) received seq=13
Jan 18 12:57:10 sipuraspa T38: duplicate packet(s) received seq=14
Jan 18 12:57:10 sipuraspa [0]FM 00028660 Rx      T38: d.hdlc_fcs_OK
Jan 18 12:57:10 sipuraspa [0]FM 00028660 Rx      T38: d.hdlc_sig_end
Jan 18 12:57:10 sipuraspa [0]FM 00028670 Rx      T38: i.no_signal
Jan 18 12:57:10 sipuraspa [0]FM 00028690 Mod MCF Frame [ 5]:  ff 13 8c a2 f1
Jan 18 12:57:10 sipuraspa [0]FM 00029260 Tx      T38: i.v21_preamble
Jan 18 12:57:11 sipuraspa [0]FM 00030300 Tx      T38: d.v21 . . .
Jan 18 12:57:11 sipuraspa [0]FM 00030320 Dem DCN Frame [ 5]:  ff 13 fb 9a f6
Jan 18 12:57:11 sipuraspa [0]FM 00030340 Tx      T38: d.hdlc_fcs_OK_sig_end
Jan 18 12:57:11 sipuraspa [0]FM 00030360 Tx      T38: i.no_signal
Jan 18 12:57:13 FM Stop RxTx Forced
Jan 18 12:57:13 sipuraspa [0]On Hook
Jan 18 12:57:13 sipuraspa T38: StopRx
Jan 18 12:57:13 sipuraspa T38: StopTx
Jan 18 12:57:13 sipuraspa [0]FM Alert Stop RxTx (c=00245e90;a=1)
Jan 18 12:57:13 sipuraspa [0: 0]AUD Rel Call
Jan 18 12:57:13 DLG Terminated 29b53c
Jan 18 12:57:13 Sess Terminated
FreeSWITCH Snippet
recv 1077 bytes from udp/[192.168.11.244]:5060 at 18:58:45.758720:
   ------------------------------------------------------------------------
   INVITE sip:8888771655@192.168.11.54:5060;transport=udp SIP/2.0
   Via: SIP/2.0/UDP 192.168.11.244:5060;branch=z9hG4bK-24fbcbe;rport
   From: FAX <sip:1030@voip.example.com>;tag=e05db621ddfca31co0
   To: <sip:8888771655@voip.example.com>;tag=vme0D1r4j4yHj
   Remote-Party-ID: FAX <sip:1030@voip.example.com>;screen=yes;party=calling
   Call-ID: 367a1245-4d4d5548@192.168.11.244
   CSeq: 103 INVITE
   Max-Forwards: 70
   Proxy-Authorization: Digest username="1030",realm="voip.example.com",nonce="6f76029c-4206-11e1-8346-294a4c7c9aeb",uri="sip:8888771655@192.168.11.54:5060",algorithm=MD5,response="a98c693c6f7b1e6f58b238c222360133",qop=auth,nc=00000002,cnonce="e4f5a7f8"
   Contact: FAX <sip:1030@192.168.11.244:5060>
   Expires: 30
   User-Agent: Linksys/SPA2102-5.2.10
   Content-Length: 269
   Content-Type: application/sdp

   v=0
   o=- 727641 727641 IN IP4 192.168.11.244
   s=-
   c=IN IP4 192.168.11.244
   t=0 0
   m=image 16388 udptl t38
   a=T38FaxVersion:0
   a=T38MaxBitRate:14400
   a=T38FaxRateManagement:transferredTCF
   a=T38FaxMaxBuffer:200
   a=T38FaxMaxDatagram:200
   a=T38FaxUdpEC:t38UDPRedundancy
   ------------------------------------------------------------------------
send 376 bytes to udp/[192.168.11.244]:5060 at 18:58:45.760791:
   ------------------------------------------------------------------------
   SIP/2.0 100 Trying
   Via: SIP/2.0/UDP 192.168.11.244:5060;branch=z9hG4bK-24fbcbe;rport=5060
   From: FAX <sip:1030@voip.example.com>;tag=e05db621ddfca31co0
   To: <sip:8888771655@voip.example.com>;tag=vme0D1r4j4yHj
   Call-ID: 367a1245-4d4d5548@192.168.11.244
   CSeq: 103 INVITE
   User-Agent: FreeSWITCH-mod_sofia/1.0.head-git-9403064 2011-08-30 09-15-27 -0500
   Content-Length: 0

   ------------------------------------------------------------------------
2012-01-18 12:58:45.761828 [DEBUG] switch_core_session.c:859 Send signal sofia/internal/1030@voip.example.com [BREAK]
2012-01-18 12:58:45.761828 [DEBUG] switch_core_session.c:859 Send signal sofia/internal/1030@voip.example.com [BREAK]
2012-01-18 12:58:45.771412 [DEBUG] sofia.c:5147 Channel sofia/internal/1030@voip.example.com entering state [received][100]
2012-01-18 12:58:45.771412 [DEBUG] sofia.c:5158 Remote SDP:
v=0
o=- 727641 727641 IN IP4 192.168.11.244
s=-
c=IN IP4 192.168.11.244
t=0 0
m=image 16388 udptl t38
a=T38FaxVersion:0
a=T38MaxBitRate:14400
a=T38FaxRateManagement:transferredTCF
a=T38FaxMaxBuffer:200
a=T38FaxMaxDatagram:200
a=T38FaxUdpEC:t38UDPRedundancy

recv 1036 bytes from udp/[64.26.150.140]:5060 at 18:58:48.927104:
   ------------------------------------------------------------------------
   INVITE sip:gw+voip.example.com-univoip.ca@192.168.11.54:5080;transport=udp;gw=voip.example.com-univoip.ca SIP/2.0
   Record-Route: <sip:64.26.150.140;lr;ftag=as66afbc98>
   Via: SIP/2.0/UDP 64.26.150.140;branch=z9hG4bK9391.9f5670a2.0
   Via: SIP/2.0/UDP 64.26.150.151:5060;received=64.26.150.151;branch=z9hG4bK5b345720;rport=5060
   Max-Forwards: 69
   From: <sip:18888771655@64.26.150.140>;tag=as66afbc98
   To: "example " <sip:example1@64.26.150.140;transport=udp>;tag=Zt796H6BBX93e
   Contact: <sip:18888771655@64.26.150.151>
   Call-ID: 46e7065c-bca9-122f-cb8c-7a91d6bec14f
   CSeq: 102 INVITE
   User-Agent: GW-2
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
   Supported: replaces, timer
   Content-Type: application/sdp
   Content-Length: 273

   v=0
   o=root 2039306861 2039306863 IN IP4 38.57.184.101
   s=Asterisk PBX 1.6.2.9
   c=IN IP4 38.57.184.101
   t=0 0
   m=image 4555 udptl t38
   a=T38FaxVersion:0
   a=T38MaxBitRate:14400
   a=T38FaxRateManagement:transferredTCF
   a=T38FaxMaxDatagram:339
   a=T38FaxUdpEC:t38UDPRedundancy
   ------------------------------------------------------------------------
send 534 bytes to udp/[64.26.150.140]:5060 at 18:58:48.934964:
   ------------------------------------------------------------------------
   SIP/2.0 100 Trying
   Via: SIP/2.0/UDP 64.26.150.140;branch=z9hG4bK9391.9f5670a2.0
   Via: SIP/2.0/UDP 64.26.150.151:5060;received=64.26.150.151;branch=z9hG4bK5b345720;rport=5060
   Record-Route: <sip:64.26.150.140;lr;ftag=as66afbc98>
   From: <sip:18888771655@64.26.150.140>;tag=as66afbc98
   To: "example " <sip:example1@64.26.150.140;transport=udp>;tag=Zt796H6BBX93e
   Call-ID: 46e7065c-bca9-122f-cb8c-7a91d6bec14f
   CSeq: 102 INVITE
   User-Agent: FreeSWITCH-mod_sofia/1.0.head-git-9403064 2011-08-30 09-15-27 -0500
   Content-Length: 0

   ------------------------------------------------------------------------
2012-01-18 12:58:48.931194 [DEBUG] switch_core_session.c:859 Send signal sofia/external/18888771655 [BREAK]
2012-01-18 12:58:48.931194 [DEBUG] switch_core_session.c:859 Send signal sofia/external/18888771655 [BREAK]
2012-01-18 12:58:48.951836 [DEBUG] sofia.c:5147 Channel sofia/external/18888771655 entering state [received][100]
2012-01-18 12:58:48.951836 [DEBUG] sofia.c:5158 Remote SDP:
v=0
o=root 2039306861 2039306863 IN IP4 38.57.184.101
s=Asterisk PBX 1.6.2.9
c=IN IP4 38.57.184.101
t=0 0
m=image 4555 udptl t38
a=T38FaxVersion:0
a=T38MaxBitRate:14400
a=T38FaxRateManagement:transferredTCF
a=T38FaxMaxDatagram:339
a=T38FaxUdpEC:t38UDPRedundancy

snip 


2012-01-18 12:59:01.821215 [WARNING] mod_spandsp_fax.c:898 sofia/internal/1030@voip.example.com already has T.38 data
2012-01-18 12:59:01.821215 [DEBUG] switch_core_session.c:713 Send signal sofia/internal/1030@voip.example.com [BREAK]
2012-01-18 12:59:01.821215 [DEBUG] mod_spandsp_fax.c:810 T38FaxVersion = 0
2012-01-18 12:59:01.821215 [DEBUG] mod_spandsp_fax.c:811 T38MaxBitRate = 14400
2012-01-18 12:59:01.821215 [DEBUG] mod_spandsp_fax.c:812 T38FaxFillBitRemoval = 0
2012-01-18 12:59:01.821215 [DEBUG] mod_spandsp_fax.c:813 T38FaxTranscodingMMR = 0
2012-01-18 12:59:01.821215 [DEBUG] mod_spandsp_fax.c:814 T38FaxTranscodingJBIG = 0
2012-01-18 12:59:01.821215 [DEBUG] mod_spandsp_fax.c:815 T38FaxRateManagement = 'transferredTCF'
2012-01-18 12:59:01.821215 [DEBUG] mod_spandsp_fax.c:816 T38FaxMaxBuffer = 200
2012-01-18 12:59:01.821215 [DEBUG] mod_spandsp_fax.c:817 T38FaxMaxDatagram = 200
2012-01-18 12:59:01.821215 [DEBUG] mod_spandsp_fax.c:818 T38FaxUdpEC = 't38UDPRedundancy'
2012-01-18 12:59:01.821215 [DEBUG] mod_spandsp_fax.c:819 T38VendorInfo = ''
2012-01-18 12:59:01.821215 [DEBUG] mod_spandsp_fax.c:820 ip = '192.168.11.244'
2012-01-18 12:59:01.821215 [DEBUG] mod_spandsp_fax.c:822 port = 16388
2012-01-18 12:59:01.821215 [DEBUG] mod_sofia.c:1331 Remote address:port [192.168.11.244:16388] has not changed.
2012-01-18 12:59:01.821215 [DEBUG] sofia_glue.c:182 sofia/internal/1030@voip.example.com image media sdp:
v=0
o=FreeSWITCH 1326896467 1326896470 IN IP4 192.168.11.54
s=FreeSWITCH
c=IN IP4 192.168.11.54
t=0 0
m=image 16656 udptl t38
a=T38FaxVersion:0
a=T38MaxBitRate:14400
a=T38FaxFillBitRemoval
a=T38FaxRateManagement:transferredTCF
a=T38FaxMaxBuffer:2000
a=T38FaxMaxDatagram:400
a=T38FaxUdpEC:t38UDPRedundancy

send 996 bytes to udp/[192.168.11.244]:5060 at 18:59:01.824912:
   ------------------------------------------------------------------------
   SIP/2.0 200 OK
   Via: SIP/2.0/UDP 192.168.11.244:5060;branch=z9hG4bK-24fbcbe;rport=5060
   From: FAX <sip:1030@voip.example.com>;tag=e05db621ddfca31co0
   To: <sip:8888771655@voip.example.com>;tag=vme0D1r4j4yHj
   Call-ID: 367a1245-4d4d5548@192.168.11.244
   CSeq: 103 INVITE
   Contact: <sip:8888771655@192.168.11.54:5060;transport=udp>
   User-Agent: FreeSWITCH-mod_sofia/1.0.head-git-9403064 2011-08-30 09-15-27 -0500
   Accept: application/sdp
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
   Supported: timer, precondition, path, replaces
   Content-Type: application/sdp
   Content-Disposition: session
   Content-Length: 318

   v=0
   o=FreeSWITCH 1326896467 1326896469 IN IP4 192.168.11.54
   s=FreeSWITCH
   c=IN IP4 192.168.11.54
   t=0 0
   m=image 16656 udptl t38
   a=T38FaxVersion:0
   a=T38MaxBitRate:14400
   a=T38FaxFillBitRemoval
   a=T38FaxRateManagement:transferredTCF
   a=T38FaxMaxBuffer:2000
   a=T38FaxMaxDatagram:400
   a=T38FaxUdpEC:t38UDPRedundancy
   ------------------------------------------------------------------------
2012-01-18 12:59:01.821215 [DEBUG] switch_core_session.c:859 Send signal sofia/internal/1030@voip.example.com [BREAK]
2012-01-18 12:59:01.821215 [DEBUG] sofia.c:5147 Channel sofia/internal/1030@voip.example.com entering state [completed][200]
2012-01-18 12:59:01.821215 [DEBUG] mod_sofia.c:1331 Remote address:port [192.168.11.244:16388] has not changed.
2012-01-18 12:59:01.821215 [DEBUG] mod_sofia.c:1331 Remote address:port [192.168.11.244:16388] has not changed.
2012-01-18 12:59:01.821215 [DEBUG] sofia_glue.c:182 sofia/internal/1030@voip.example.com image media sdp:
v=0
o=FreeSWITCH 1326896467 1326896471 IN IP4 192.168.11.54
s=FreeSWITCH
c=IN IP4 192.168.11.54
t=0 0
m=image 16656 udptl t38
a=T38FaxVersion:0
a=T38MaxBitRate:14400
a=T38FaxFillBitRemoval
a=T38FaxRateManagement:transferredTCF
a=T38FaxMaxBuffer:2000
a=T38FaxMaxDatagram:400
a=T38FaxUdpEC:t38UDPRedundancy

2012-01-18 12:59:01.821215 [DEBUG] switch_core_session.c:859 Send signal sofia/internal/1030@voip.example.com [BREAK]
2012-01-18 12:59:01.831282 [DEBUG] switch_ivr_bridge.c:586 BRIDGE THREAD DONE [sofia/external/18888771655]
2012-01-18 12:59:01.831282 [DEBUG] switch_ivr_bridge.c:606 Send signal sofia/internal/1030@voip.example.com [BREAK]
2012-01-18 12:59:01.831282 [DEBUG] switch_core_state_machine.c:388 (sofia/external/18888771655) State EXCHANGE_MEDIA going to sleep
2012-01-18 12:59:01.831282 [DEBUG] switch_core_state_machine.c:330 (sofia/external/18888771655) Running State Change CS_RESET
2012-01-18 12:59:01.831282 [DEBUG] switch_core_state_machine.c:381 (sofia/external/18888771655) State RESET
2012-01-18 12:59:01.831282 [DEBUG] mod_sofia.c:166 sofia/external/18888771655 SOFIA RESET
2012-01-18 12:59:01.831282 [DEBUG] mod_spandsp_fax.c:1783 (sofia/external/18888771655) State Change CS_RESET -> CS_CONSUME_MEDIA
2012-01-18 12:59:01.831282 [DEBUG] switch_core_session.c:1164 Send signal sofia/external/18888771655 [BREAK]
2012-01-18 12:59:01.831282 [DEBUG] switch_core_state_machine.c:381 (sofia/external/18888771655) State RESET going to sleep
2012-01-18 12:59:01.831282 [DEBUG] switch_core_state_machine.c:330 (sofia/external/18888771655) Running State Change CS_CONSUME_MEDIA
2012-01-18 12:59:01.831282 [DEBUG] switch_core_state_machine.c:397 (sofia/external/18888771655) State CONSUME_MEDIA
2012-01-18 12:59:01.831282 [DEBUG] switch_core_session.c:713 Send signal sofia/external/18888771655 [BREAK]
2012-01-18 12:59:01.831282 [DEBUG] mod_spandsp_fax.c:1630 Raw read codec activation Success L16 20000
2012-01-18 12:59:01.831282 [DEBUG] switch_core_codec.c:116 sofia/external/18888771655 Push codec L16:70
2012-01-18 12:59:01.831282 [DEBUG] mod_spandsp_fax.c:1646 Raw write codec activation Success L16
Retrieved from "http://wiki.freeswitch.org/wiki/SPA2102_T38_Howto"
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