[SR-Users] strange behavior when trying to reach PSTN gateway via TCP

[Daniel-Constantin Mierla]

Hello,

you haven't disabled tcp support, right? Can you do 'kamctl ps' and see 
if you have tcp workers?

I see the error is related to 10.198.3.100:5060 :

10(36629) ERROR:<core>  [tcp_main.c:2748]: connect 10.198.3.100:5060 failed Socket is not connected

What is listening on this ip and port? In drouting table you have 
10.198.3.100:5068;transport=tcp -- a different port.

Then, do you need to enable and play with mtu params? This is for 
auto-switching from UDP to TCP when size of SIP message exceeds udp_mtu 
value in bytes, done by SIP server, but if the other party is not 
listening on tcp, then it won't work (reason is disabled by default) -- 
note that this switching will be done for all sip messages.

Cheers,
Daniel


On 11/15/11 11:43 AM, Dmitry Petrakoff wrote:
> Hi List!
>
> I'm running Kamailio for about 1 year without any serious problems.
> When it works with UDP only, it runs perfectly well for us. Without any
> major issues.
>
> But now we have a customer who wants to connect Lync to our network.
> Unfortunately, Lync does not support UDP for SIP signalling, so we tried
> to teach kamailio to send SIP messages via TCP.
> And getting  strange error:
>
> 10(36629) DEBUG: tm [t_reply.c:659]: DEBUG: reply sent out.
> buf=0x832c7ac: SIP/2.0 100 trying -..., shmem=0x28d97c7c: SIP/2.0 100
> trying -
> 10(36629) DEBUG: tm [t_reply.c:669]: DEBUG: _reply_light: finished
> 10(36629) DEBUG:<core>  [forward.c:213]: DEBUG: get_out_socket: socket
> determined: 0x833ddc0
> 10(36629) DEBUG:<core>  [msg_translator.c:457]: clen_builder:
> content-length: 553 (553)
> 10(36629) DEBUG:<core>  [msg_translator.c:204]:
> check_via_address(10.200.245.200, 10.200.245.200, 0)
> 10(36629) DEBUG:<core>  [tcp_main.c:1824]: tcp_send: no open tcp
> connection found, opening new one
> 10(36629) DEBUG:<core>  [ip_addr.c:247]: tcpconn_new: new tcp
> connection: 10.198.3.100
> 10(36629) DEBUG:<core>  [tcp_main.c:1081]: tcpconn_new: on port 5060, type 2
> 10(36629) DEBUG:<core>  [tcp_main.c:1382]: tcpconn_add: hashes: 0:0:0, 1
> 10(36629) ERROR:<core>  [tcp_main.c:2748]: connect 10.198.3.100:5060
> failed Socket is not connected
> 10(36629) ERROR:<core>  [tcp_main.c:2754]: 10.198.3.100:5060: connect&
> send  for 0x28d988ac failed: Socket is not connected (57)
> 10(36629) DEBUG:<core>  [tcp_main.c:2955]: tcpconn_chld_put: destroying
> connection 0x28d988ac (1, -1) flags 0060
> 10(36629) ERROR: tm [../../forward.h:170]: msg_send: ERROR: tcp_send failed
>
> We tested two different variants: one when defined Lync in dr_gateways
> table as 10.198.3.100:5068;transport=tcp
>
> And then, tried global options
> udp_mtu=1300
> udp_mtu_try_proto=TCP
>
> As soon as these options were enabled, all other gateways became
> unreachable with the same error as above.
>
> Could you please to point me out, where I'm wrong?
>
> fbsd-kam# /usr/local/sbin/kamailio -V
> version: kamailio 3.1.5 (i386/freebsd) ec672a
> flags: STATS: Off, USE_IPV6, USE_TCP, USE_TLS, TLS_HOOKS, USE_RAW_SOCKS,
> DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC,
> DBG_QM_MALLOC, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER,
> USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
> ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16,
> MAX_URI_SIZE 1024, BUF_SIZE 65535, PKG_SIZE 4MB
> poll method support: poll, select, kqueue.
> id: ec672a
> compiled on 11:02:58 Nov 15 2011 with gcc 4.2.1
>
> FreeBSD fbsd-kam.dprs-consulting.com 8.2-RELEASE-p2 FreeBSD
> 8.2-RELEASE-p2 #0: Sun Jul  3 17:49:13 GMT 2011
> root at fbsd-kam.dprs-consulting.com:/usr/obj/usr/src/sys/GENERIC  i386
>
> Routing script could be sent on request.
>
> Thank you very much!
>
> WBR
> Dimon
>
>
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-- 
Daniel-Constantin Mierla -- http://www.asipto.com
Kamailio Advanced Training, Dec 5-8, Berlin: http://asipto.com/u/kat
http://linkedin.com/in/miconda -- http://twitter.com/miconda