<div dir="auto"><div>Simon,<div dir="auto"><br></div><div dir="auto">It's possible that RTPengine is replacing both payload specific and session level c lines. Does your downstream SDP contain a session level c line ? From the documentation it sounds like rtpengine might be introducing one.</div><div dir="auto"><br></div><div dir="auto"><br></div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Nov 15, 2024, 4:18 AM Simon Gajski via Users <<a href="mailto:users@lists.opensips.org">users@lists.opensips.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
<div>
<p>Hi<br>
<br>
We are doing a SIP interconnection with one of carriers that sends
us Invite with SDP where "c=IN" parameter is defined twice.<br>
<span style="color:rgb(79,79,79);font-family:"Roboto Mono",monospace;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;white-space:pre-wrap;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;display:inline!important;float:none">
v=0
o=- 33593 33593 IN IP4 172.29.1.2
s=-
</span><font color="#ff0000"><b><span style="font-family:"Roboto Mono",monospace;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;white-space:pre-wrap;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;display:inline!important;float:none">c=IN IP4 172.29.3.4</span></b></font><span style="color:rgb(79,79,79);font-family:"Roboto Mono",monospace;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;white-space:pre-wrap;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;display:inline!important;float:none">
t=0 0
a=sendrecv
</span><span style="box-sizing:border-box;font-family:"Roboto Mono",monospace;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;white-space:pre-wrap;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;font-weight:bold;color:dimgray">m=audio 36440 RTP/AVP 8 18 96</span><span style="color:rgb(79,79,79);font-family:"Roboto Mono",monospace;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;white-space:pre-wrap;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;display:inline!important;float:none">
</span><font color="#ff0000"><b><span style="font-family:"Roboto Mono",monospace;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;white-space:pre-wrap;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;display:inline!important;float:none">c=IN IP4 172.29.3.4</span></b></font><span style="color:rgb(79,79,79);font-family:"Roboto Mono",monospace;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;white-space:pre-wrap;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;display:inline!important;float:none">
b=RR:0
b=RS:0
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=yes
a=rtpmap:96 telephone-event/8000
a=fmtp:96 0-15
a=maxptime:40</span></p>
<div><br>
We are using opensips 3.4.2 with rtpengine 10.5.0.0 to act as SBC<br>
Problem is that when opensips forwards such INVITE to next hop,
rtpengine changes accordinly only second line of 'c' parameter,
resulting in no media.<br>
<br>
I never ran into duplicate line of 'c' param in SDP.<br>
<br>
My question: Is it possible to remove one of duplicated lines
before rtpengine handles it or if anyone knows how to process both
lines in rtpengine?<br>
Carrier is one of national telcos and won't remove it. So I need
to figure out how to solve it on our side.<br>
<br>
Thank you for any tip<br>
<br>
BR<br>
Simon<br>
</div>
</div>
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</blockquote></div></div></div>