[SIPForum-discussion] One way talk path

[Sriram Subramanian]

Hi Punitha,
                  Can you cross check the following as a first measure in ur
scenario??

1)Check the IP adress and port in the OFFER AND ANSWER SDP parameters
??.mostly it might be a cse of wrong IP address in the connection line if
there is a no SIP ALG Involved.

2)If SIP ALG is involved ,first lemme explain wat a SIP ALG is, it is a
Application Gateway which acts as a mediator when it is deplyed and will
change the ipaddress and Port parameters accordingly a typical example for
better understanding is

INVITE --x.x.x.x:5060----in SDP C line x.x.x.x and M line port
xxxx------->SIP ALG---->INVITE ----y.y.y.y. 5060---in SDP C line y.y.y.y.
and port as yyyy

so in this scenario if the port mapping in SDP has been missed by the SIP
ALG u will end up in a one way Audio call..In Total to summarise for ur
problem chk ur SDP parameters mainly and check in the wireshark for the RTP
packets where it is sent ...


I hope this resolves ur problem ,But as the other experts have said more
debugging can be done only based on ur wireshark traces if u can send them

Regards,
Sriram




On Sat, Aug 22, 2009 at 11:11 AM, dinesh gupta
<dinesh.gupta2005 at gmail.com>wrote:

> Hi Punita,
>
>
>
> As every one say take a ethereal call trace (wireshark) it is right way to
> track your problem. If you are using Firewall in your network it may be
> blocking some RTP port. You should check you have allowed all media RTP port
> in firewall.
>
> You should also check
>
> 1-NAT
>
> 2- Codec negotiation in SDP
>
>
> Thanks
>  Dinesh
>  On Wed, Aug 19, 2009 at 3:58 PM, Chaurasia, Punita (Punita) <
> pchaurasia at avaya.com> wrote:
>
>>
>> Hi all,
>>
>> I am new to SIP world. I would like to know what exactly to look for 'one
>> way talk path' issues with sip calls.
>>
>> we have a avaya communication manager -- ses -- alcatel sip configuration.
>> If a  Digital station (DCP) calls an sip end point on Alcatel switch .. the
>> call works fine .. but with the reverse.. there is no talk path.
>>
>> I have the sip call logs for both the calls .. but not able to understand
>> ..what exactly should I look for ..  in order to find out the issue.
>>
>> Need your expert help.
>>
>> Thanks!
>>
>> Punita
>>
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>
>
> --
> Thanks & Regards,
>
> Dinesh Gupta
>
>
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