[SR-Users] rtpengine inserted random line into sdp

[Richard Fuchs]

Rtpengine takes and replaces the entire SDP body, so if there's another 
module also manipulating the SDP, one module won't see the changes made 
by the other one unless you call msg_apply_changes in between, leaving 
you with bits of string in the wrong places.

Cheers

On 26/06/2020 08.50, Andrew Chen wrote:
> Thanks Richard.
>
> I do have the nathelper module running but not rtpproxy. How does 
> nathelper cause this issue?
>
> On Fri, Jun 26, 2020 at 8:27 AM Richard Fuchs <rfuchs at sipwise.com 
> <mailto:rfuchs at sipwise.com>> wrote:
>
>     Looks like you're using both rtpengine and some other
>     SDP-modifying module together, such as nathelper or rtpproxy,
>     without calling msg_apply_changes() in between.
>
>     Cheers
>
>     On 25/06/2020 16.46, Andrew Chen wrote:
>>     Hi forum,
>>
>>     I'm starting my rtpengine project and I'm facing a strange
>>     problem with rtpengine.  I am seeing this in the SDP part of the
>>     INVITE:
>>
>>     a=rtcp:52021
>>
>>     a=rtcp-mux
>>
>>     2001:470:7:3A7:0:0:0:2
>>
>>     a=direction:active
>>
>>     a=oldmediaip:54.153.25.234
>>
>>
>>     As you can see there is a random insert of the local kamailio IP
>>     in there and I'm have tried the following to remove it but failed
>>     to succeed:
>>
>>     - Remove in the offer the combination of ICE and
>>     replace-session-connection flags
>>     - Switched between rtpengine_offer and rtpengine_manage
>>     - Restarted ngcp-rtpengine-daemon process
>>     - Used sdpops function sdp_remove_line_by_preifx()
>>
>>     Currently running Kamailio 5.1.2.
>>
>>     I am running out of ideas.
>>
>>     Any suggestions would be greatly appreciated.
>>
>>     -- 
>>     Andy Chen
>>     Sr. Telephony Lead Engineer
>>     achen@ <mailto:achen at thinkingphones.com>fuze.com <http://fuze.com>
>>
>>
>>
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> -- 
> Andy Chen
> Sr. Telephony Lead Engineer
> 415 516 5535 (M)
> achen@ <mailto:achen at thinkingphones.com>fuze.com <http://fuze.com>
>
>
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