[OpenSIPS-Users] Source port in SIP replies

[Bogdan-Andrei Iancu]

Hi Alexandr,

Alexandr A. Alexandrov wrote:
> Hi!
>
> I ran into a pretty weird situation last day. I'm using opensips-1.6.2 
> as a load balancer for several * servers.
> Everything worked fine for months, but suddenly opensips started to use 
> ports like 56827 or 51234 (does not matter, just non-default, not the 
> one it is listening on). And the operator's system does not allow such 
> replies, it just drops them.
> Opensips is listening on port 5070 on my system.
>
> Invite comes like:
> User Datagram Protocol, Src Port: sip (5060), Dst Port: vtsas (5070)
> INVITE sip:xxxxx at my.ip:5070;user=phone SIP/2.0
>
> Reply goes like:
> User Datagram Protocol, Src Port: 52795 (52795), Dst Port: sip (5060)
> SIP/2.0 100 Giving a try
>
> Normally src port is always 5070.
>
> So, the questions are:
> - under what conditions does opensips decide to invent a new port?
under no conditions - it will use only the defined interfaces from cfg...

Are you sure about that port changing ? could you provide a pcap showing 
this ?

Regards,
Bogdan


-- 
Bogdan-Andrei Iancu
OpenSIPS Bootcamp
15 - 19 November 2010, Edison, New Jersey, USA
www.voice-system.ro