<p></p>
<h3>Description</h3>
<p>As described at <a href="https://datatracker.ietf.org/doc/html/rfc3605#section-2.1" rel="nofollow">RFC3605</a></p>
<pre><code>rtcp-attribute =  "a=rtcp:" port  [nettype space addrtype space  connection-address] CRLF
</code></pre>
<p>So IP info is optional.</p>
<h3>Troubleshooting</h3>
<h4>Log Messages</h4>
<pre><code>Jun 7 09:55:57 sp2 lb[46796]: ERROR: DEFAULT_ROUTE nathelper [nathelper.c:1796]: nh_extract_mediaip(): no `IP[4|6]' in `a=rtcp' field
Jun 7 09:55:57 sp2 lb[46796]: ERROR: DEFAULT_ROUTE nathelper [nathelper.c:1617]: replace_sdp_ip(): can't extract 'a=rtcp' IP from the SDP
</code></pre>
<h4>SIP Traffic</h4>
<pre><code>INVITE sip:jsung2@192.168.88.194;line=8c86b7427b1107f SIP/2.0
Via: SIP/2.0/UDP 192.168.88.194;branch=z9hG4bK4f82.52fb005dac4fe078dd5593a1bebfa33b.0
From: <sip:4316607564835@xxxx>;tag=40FED3EF-60BDED10000D2F23-71F92700
To: <sip:jsung2@xxxx>
CSeq: 939 INVITE
Call-ID: CDqyvKE3ryYIRkecp_7cXA..
Max-Forwards: 69
Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, MESSAGE, OPTIONS, SUBSCRIBE
P-Asserted-Identity: <sip:4316607564835@sip.lab.com>
Diversion: <sip:4316607564835@xxxx>;privacy=off;counter=1
Supported: timer
Session-Expires: 1800
Min-SE: 90
Content-Type: application/sdp
Content-Length: 316
Contact: <sip:btpsh-60baedf4-645b-3@192.168.88.194>

v=0
o=Z 1623059728682 1 IN IP4 192.168.88.194
s=Z
c=IN IP4 192.168.88.194
t=0 0
m=audio 20252 RTP/AVP 8 0 9 98 101
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:9 G722/8000
a=rtpmap:98 telephone-event/48000
a=fmtp:98 0-16
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=sendrecv
a=rtcp:20253
</code></pre>
<h3>Possible Solutions</h3>
<p>fix for nathelper will follow</p>
<h3>Additional Information</h3>
<pre><code>version: kamailio 5.5.0 (x86_64/linux)
</code></pre>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly, <a href="https://github.com/kamailio/kamailio/issues/2768">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe-auth/ABO7UZJPFMG2UOUNUOPYMKTTR4XBVANCNFSM46LUGQ5Q">unsubscribe</a>.<img src="https://github.com/notifications/beacon/ABO7UZJBWUHLO2RYSAACWJDTR4XBVA5CNFSM46LUGQ52YY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4NUY2JHA.gif" height="1" width="1" alt="" /></p>
<script type="application/ld+json">[
{
"@context": "http://schema.org",
"@type": "EmailMessage",
"potentialAction": {
"@type": "ViewAction",
"target": "https://github.com/kamailio/kamailio/issues/2768",
"url": "https://github.com/kamailio/kamailio/issues/2768",
"name": "View Issue"
},
"description": "View this Issue on GitHub",
"publisher": {
"@type": "Organization",
"name": "GitHub",
"url": "https://github.com"
}
}
]</script>