[OpenSER-Users] port modification is sdp

[Konstantinos Koutsopoulos]

Hi Bogdan,

exactly that is why I did not manage to explain, although I am 
relatively new user to openser.
I tried to locate documentation that explains this behaviour and I found 
that no module
performing such action is loaded and configured in my set-up. I have 
just captured the
packets to and form openser and saw that openser alters the sdp fields.

Regards,

Kostas

Bogdan-Andrei Iancu wrote:
> Hi,
>
> But who is changing the IP and port in SDP? The script you sent makes 
> no changes on the SDP part of the messages.
>
> regards,
> bogdan
>
> Konstantinos Koutsopoulos wrote:
>> Hi Bogdan,
>>
>> thanks for the response, but I actually need the ports to remain the 
>> same.
>> The address modification is convenient.
>>
>> Kostas
>>
>>
>> Bogdan-Andrei Iancu wrote:
>>  
>>> Hi Kostas,
>>>
>>> If you want to change only the port, try the mangle module:
>>>    http://www.openser.org/docs/modules/1.2.x/mangler.html#AEN99
>>>
>>> Regards,
>>> Bogdan
>>>
>>> Konstantinos Koutsopoulos wrote:
>>>    
>>>> Hi,
>>>>
>>>> I am deploying openser 1.2.2-notls on a machine with public IP.
>>>> On the same machine I run a sip client (A) that registers with the
>>>> above openser.
>>>>
>>>> On an another machine behind NAT (typical adsl router) I use a sip 
>>>> client (B)
>>>> to register with the above openser and try to invite sip client A.
>>>>
>>>> I do not use any NAT-traversal techniques (the outgoing packets from
>>>> B are modified by NAT and reach openser, responses are received by
>>>> B through NAT due to statefull (?) routing on the NAT).
>>>>
>>>> The SIP messages reach their destination properly and moreover
>>>> the IP addresses in the SDP (from B) are updated by openser
>>>> to indicate the external interface of NAT. This is very useful in
>>>> my case since the client A sends the media packets to the proper
>>>> address (I also configure virtual servers on the adsl router to have
>>>> these forwarded to B). However, the port numbers in the SDP are
>>>> also updated (usually by an offset of +16) which hinders the media 
>>>> session
>>>> from A to B since B is expecting the packets on other ports.
>>>>
>>>> Is there any way to have the ports remain unaltered during the 
>>>> above operation?
>>>>
>>>> Thanks in advance,
>>>>
>>>> Kostas
>>>>
>>>>         
>>>     
>>
>>
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>
>