Hello,

if there are no errors reported by Kamailio, maybe the outgoing queue for the socket is full and the kernel discards messages, check with netstat.

Another option could be that the sngrep fails to capture it, maybe the src/dst ports are random and I do not now what are the rules sngrep use for catching sip traffic.

Cheers, Daniel

On 18.07.24 15:02, Jon Bonilla (Manwe) via sr-users wrote:

Hi all

version 5.7.6 Debian 12

I'm having issues with a kamailio server not sending 200 to some OPTIONS requests. It does send 200 to some subscribers but not 100% of the time to 100% of subs. I have enabled debug=3 in that server and this is what I found:

If the log says that it found existing tcp connection and it's reusing it I can't see the 200ok in a sngrep capture. Example:

<core> [core/receive.c:126]: sip_check_fline(): first line indicates a SIP reply

<core> [core/tcp_main.c:1722]: _tcpconn_find(): found connection by id: 2

<core> [core/tcp_main.c:2614]: tcpconn_send_put(): send from reader (360359 (18)), reusing fd

<core> [core/tcp_main.c:2845]: tcpconn_do_send(): sending...

<core> [core/tcp_main.c:2881]: tcpconn_do_send(): after real write: c= 0x7fb0faa893d8 n=384 fd=14 <core> [core/tcp_main.c:2882]: tcpconn_do_send(): buf=#012SIP/2.0 200 Keepalive#015#012Via: SIP/2.0/TCP 10.35.190.105:5060;branch=z9hG4bK15ebf764;rport=55894;received=1.1.1.186#015#012From: "Unknown" sip:contesta01@10.35.190.105;tag=as5311c3a7#015#012To: <sip: 1.1.1.138>;tag=054524a74bcccf444a0f08f67c5b7657.d07b5401#015#012Call-ID: 15dcd38c46f915576ded132a11d8ff4c@10.35.190.105:5060#015#012CSeq: 102 OPTIONS#015#012Server: aaa SBC#015#012Content-Length: 0#015#012#015#012

<core> [core/receive.c:531]: receive_msg(): request-route executed in: 302 usec

On the other side, if kamailio doesn't find an existing tcp connection (at least nothing in the logs about that) I can see the 200 ok in sngrep. Example:

<core> [core/receive.c:126]: sip_check_fline(): first line indicates a SIP reply

<core> [core/receive.c:531]: receive_msg(): request-route executed in: 295 usec

All subs use tcp. And the kamailio.cfg is very simple regarding OPTIONS: Sanity, check maxfwd and sl_send_reply(200).

Any hints?

cheers,

Jon

-- PekePBX, the multitenant PBX solution https://pekepbx.com

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