[OpenSIPS-Users] Source port in SIP replies

[Bogdan-Andrei Iancu]

Hi Alexandr,

Alexandr A. Alexandrov wrote:
> Hi Bogdan,
>
> Well, this confuses me even more...
> I though that in case opensips can not open socket on the port it 
> listens on, it tries to open a socket on a port where it can, and then 
> send the packet out...
>   
all the local ports are open at startup time - there is no local socket 
created at runtime (for UDP).

I'm really sure that opensips is not messing with the ports, this is why 
I was asking for the pcap....just to check what happens at network level.

Regards,
Bogdan
> This would not break any standarts, AFAIK (even though firewalls might 
> get crazy about this, which is, pitifully, my case).
>
> Regards,
> Alex
>
>
> 06.10.2010 15:26, 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
>>
>>
>>    
>>     
>
>
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>   


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