Hi,<div><br></div><div>I&#39;m having some trouble discovering the source and solution to one problem.</div><div><br></div><div>I setup a FS box for receiving faxes, and a already have another FS box as SBC.</div><div><br>

</div><div><br></div><div>SPA3102   ---&gt; opensips ---&gt; FS_SBC --&gt; opensips --&gt; FS_FAX</div><div>this works ok, call gets answered, i hear the fax tone, the SPA3102 changes to T38 and everyone is happy.</div><div>

<br></div><div><br></div><div>Nortel CS2000   ------&gt; FS_SBC -------&gt; opensips(regitrar,rtpproxy,etc) ---&gt; FS_FAX</div><div>but his doen&#39;t.</div><div><br></div><div>This little devil CS2000 sends every invite with m=image header along with m=audio. With aparently FS doesn&#39;t like.</div>

<div><br></div><div><br></div><div>like that:</div><div><br></div><div><div>freeswitch@internal&gt; recv 1215 bytes from udp/[10.143.82.250]:5060 at 08:26:08.226858:</div><div>   ------------------------------------------------------------------------</div>

<div>   INVITE sip:4730365302@10.143.82.253:5060;transport=UDP;user=phone SIP/2.0</div><div>   Record-Route: &lt;sip:10.143.82.250;lr=on;ftag=-45026-10d9cdb-2668a317-10d9cdb&gt;</div><div>   f: &lt;sip:4784064435@10.150.65.16:5060;user=phone&gt;;tag=-45026-10d9cdb-2668a317-10d9cdb</div>

<div>   t: &lt;sip:4730365302@10.143.82.250:5060;user=phone&gt;</div><div>   i: 416cf3e01041960a13c410d9cdb1d2cba42b82409c10f14bb8-0322-4481</div><div>   CSeq: 1 INVITE</div><div>   User-agent: CS2000_NGSS/9.0</div><div>
   P-Asserted-Identity: &lt;<a href="mailto:sip%3A4784064435@10.150.65.16">sip:4784064435@10.150.65.16</a>;user=phone&gt;</div>
<div>   Allow: ACK,BYE,CANCEL,INVITE,OPTIONS,INFO,SUBSCRIBE,REFER,NOTIFY,PRACK,UPDATE</div><div>   Via: SIP/2.0/UDP 10.143.82.250;branch=z9hG4bK1d78.5262ccd1.0</div><div>   v: SIP/2.0/UDP PAE1CS2K:5060;maddr=10.150.65.16;branch=z9hG4bK-10d9cdb-1d2cba43-57ebb21d</div>

<div>   Max-Forwards: 69</div><div>   m: &lt;sip:10.150.65.16:5060;transport=UDP&gt;</div><div>   k: 100rel</div><div>   c: application/sdp</div><div>   l: 420</div><div><br></div><div>   v=0</div><div>   o=PVG 1315110636830 1315110636830 IN IP4 10.152.204.202</div>

<div>   s=-</div><div>   p=+1 6135555555</div><div>   c=IN IP4 10.152.204.202</div><div>   t=0 0</div><div>   m=audio 55920 RTP/AVP 18 8 101</div><div>   a=rtpmap:101 telephone-event/8000</div><div>   a=fmtp:101 0-15</div>

<div>   a=ptime:20</div><div>   a=fmtp:18 annexb=no</div><div>   m=image 64112 udptl t38</div><div>   a=T38FaxVersion:0</div><div>   a=T38FaxMaxBuffer:1100</div><div>   a=T38FaxMaxDatagram:612</div><div>   a=T38MaxBitRate:14400</div>

<div>   a=T38FaxRateManagement:transferredTCF</div><div>   a=T38FaxUdpEC:t38UDPRedundancy</div></div><div><br></div><div>But then we have a problem ...</div><div><br></div><div><br></div><div><br></div><div><br></div><div>

My beloved FS_SBC changes the SDP before sending it to the next hop .. as it should becase they are on diferent subnets and set to proxy_media</div><div><br></div><div><div>2011-09-04 01:26:08.231102 [DEBUG] sofia_glue.c:1759 sofia/tpa/4730365302 Patched SDP</div>

<div>---</div><div>v=0</div><div>o=PVG 1315110636830 1315110636830 IN IP4 10.152.204.202</div><div>s=-</div><div>p=+1 6135555555</div><div>c=IN IP4 10.152.204.202</div><div>t=0 0</div><div>m=audio 55920 RTP/AVP 18 8 101</div>

<div>a=fmtp:18 annexb=no</div><div>a=rtpmap:101 telephone-event/8000</div><div>a=fmtp:101 0-15</div><div>a=ptime:20</div><div>m=image 64112 udptl t38</div><div>a=T38FaxVersion:0</div><div>a=T38FaxMaxBuffer:1100</div><div>

a=T38FaxMaxDatagram:612</div><div>a=T38MaxBitRate:14400</div><div>a=T38FaxRateManagement:transferredTCF</div><div>a=T38FaxUdpEC:t38UDPRedundancy</div><div><br></div><div>+++</div><div>v=0</div><div>o=FreeSWITCH 2718891449 2718891450 IN IP4 A.B.C.D</div>

<div>s=FreeSWITCH</div><div>p=+1 6135555555</div><div>c=IN IP4 A.B.C.D</div><div>t=0 0</div><div>m=audio 19262 RTP/AVP 18 8 101</div><div>a=fmtp:18 annexb=no</div><div>a=rtpmap:101 telephone-event/8000</div><div>a=fmtp:101 0-15</div>

<div>a=ptime:20</div><div>m=image 19262 udptl t38</div><div>a=T38FaxVersion:0</div><div>a=T38FaxMaxBuffer:1100</div><div>a=T38FaxMaxDatagram:612</div><div>a=T38MaxBitRate:14400</div><div>a=T38FaxRateManagement:transferredTCF</div>

<div>a=T38FaxUdpEC:t38UDPRedundancy</div></div><div><br></div><div><br></div><div>so we have now  2  m=   fields with the same port !!!!!</div><div><br></div><div>then when it gets answered on the FS_FAX box .. we got disconnection on the FS_SBC box</div>

<div><br></div><div><br></div><div><div>2011-09-04 01:26:08.257064 [DEBUG] sofia.c:4761 Channel sofia/tpa/4730365302 entering state [completing][200]</div><div>2011-09-04 01:26:08.257064 [DEBUG] sofia.c:4772 Remote SDP:</div>

<div>v=0</div><div>o=FreeSWITCH 1315079202 1315079203 IN IP4 189.45.192.19</div><div>s=FreeSWITCH</div><div>c=IN IP4 189.45.192.19</div><div>t=0 0</div><div>m=audio 31436 RTP/AVP 8 101</div><div>a=rtpmap:8 PCMA/8000</div>

<div>a=rtpmap:101 telephone-event/8000</div><div>a=fmtp:101 0-16</div><div>a=silenceSupp:off - - - -</div><div>a=ptime:20</div><div>m=image 0 udptl 19</div><div><br></div><div>2011-09-04 01:26:08.258409 [DEBUG] sofia.c:4761 Channel sofia/tpa/4730365302 entering state [ready][200]</div>

<div>2011-09-04 01:26:08.258409 [DEBUG] switch_channel.c:2830 (sofia/tpa/4730365302) Callstate Change RINGING -&gt; ACTIVE</div><div>2011-09-04 01:26:08.258409 [DEBUG] switch_channel.c:2842 Send signal sofia/voxip/<a href="http://4784064435@10.150.65.16:5060">4784064435@10.150.65.16:5060</a> [BREAK]</div>

<div>2011-09-04 01:26:08.258409 [NOTICE] sofia.c:5318 Channel [sofia/tpa/4730365302] has been answered</div><div>2011-09-04 01:26:08.258409 [DEBUG] sofia_glue.c:2774 Set Codec sofia/tpa/4730365302 PROXY/8000 20 ms 160 samples 0 bits</div>

<div><font class="Apple-style-span" color="#ff0000">2011-09-04 01:26:08.258409 [DEBUG] sofia_glue.c:3079 PROXY AUDIO RTP [sofia/tpa/4730365302] A.B.C.D:19262-&gt;W.X.Y.Z:0 codec: 0 ms: 20</font></div><div><font class="Apple-style-span" color="#ff0000">2011-09-04 01:26:08.258409 [ERR] sofia_glue.c:3512 AUDIO RTP REPORTS ERROR: [Missing remote port]</font></div>

<div>2011-09-04 01:26:08.258409 [DEBUG] switch_channel.c:2563 (sofia/tpa/4730365302) Callstate Change ACTIVE -&gt; HANGUP</div><div>2011-09-04 01:26:08.258409 [NOTICE] sofia_glue.c:3513 Hangup sofia/tpa/4730365302 [CS_CONSUME_MEDIA] [DESTINATION_OUT_OF_ORDER]</div>

<div>2011-09-04 01:26:08.258409 [DEBUG] switch_channel.c:2579 Send signal sofia/tpa/4730365302 [KILL]</div><div>2011-09-04 01:26:08.258409 [DEBUG] switch_core_session.c:1116 Send signal sofia/tpa/4730365302 [BREAK]</div>
<div>
2011-09-04 01:26:08.259605 [DEBUG] switch_ivr_originate.c:3299 Originate Resulted in Error Cause: 27 [DESTINATION_OUT_OF_ORDER]</div><div>2011-09-04 01:26:08.259605 [INFO] mod_dptools.c:2647 Originate Failed.  Cause: DESTINATION_OUT_OF_ORDER</div>

</div><div><br></div><div><br></div><div>port = 0 !!!</div><div><br></div><div>is that maybe a fault in opensips in the middle because the both m= fields with the same port ? , or one of the FS boxes ?</div><div>something is broken here, sadly :(</div>

<div><br></div><div>Appreciate any help.</div><div><br></div><div>Allan</div><div><br></div><div><br></div>