[Freeswitch-dev] sofia_glue - sdp with m=image 0

[Anthony Minessale]

post a trace with "sofia global siptrace on"
its too hard to diagnose without the exact trace.


On Thu, Mar 21, 2013 at 10:03 AM, Wolfgang Pichler <wpichler at yosd.at> wrote:

> Hi all,
>
> i have encountered a strange behaviour - and i think i have found a
> possible problem within sofia_glue
>
> Following scenario:
>
> Carrier sends INVITE with T38 Offer -> Freeswitch does forward offer ->
> asterisk does forward offer -> ATA
>
> In this scenario it happend to me - that the T38 Offer (with corrent
> m=image and port in sdp) got forwarded by freeswitch to asterisk, asterisk
> did forwarded without the T38 Offer (don't know why) - so also without the
> m=image sdp part - the ATA did answered correctly (without m=image part) ->
> asterisk did created a new sdp with m=image 0, without T38 parts - and
> returned this to freeswitch.
>
> Freeswitch did hangup the call - because sofia_glue did extracted the port
> 0 as audio port - and this is not a legal port...
>
> Sending port 0 is according to rfc legal - so freeswitch should ignore it
> in this case.
>
> the question is - if both values are given - which one is the value we
> need ? I think the audio port is the port which is of higher priority.
>
> So the workflow should be:
>  - Try to extract audio port from m=audio part.
>  - If you got it - and it is a valid port then go on
>  - else try to extract audio port from m=image part...
>
> The function in question is sofia_glue_tech_proxy_remote_addr - in
> sofia_glue.c
>
> Is it generaly a good idea to use the m=image part as audio port ? Why is
> there no direct image port member in the pvt structure as with the video
> port ?
>
> Hope someone can help here...
>
> br,
> Wolfgang
>
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-- 
Anthony Minessale II

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