[Freeswitch-users] OneWay audio after hold->unhold

[Bob Hartwig]

Is this an Avaya AS5300 by any chance?  Those have some serious interop
issues when it comes to transfers.  I had to struggle mightily to get a
client's product (not Freeswitch) to interoperate with it.  I'm really
interested to hear if this gets resolved for Freeswitch.



On Fri, Sep 4, 2015 at 11:09 AM, Prashanth Devarajappa <
Prashanth.Devarajappa at enghouse.com> wrote:

> Hello,
>
>
>
> I am connecting to Avaya switch using SIP trunk interface from FS with TLS
> & SRTP connection. This works well for inbound and outbound calls. I have
> an issue with media, when I try hold -> unhold operation from FS for an
> outbound call.
>
>
>
> When FS tries to unhold the call by sending Re-INVITE, avaya responds with
> 200 OK. Then sends INVITE w/o SDP to shuffle the media(IP Shuffling, to
> make media flow directly b/w endpoints). FS responds with 200 OK + SDP as
> expected. Now avaya sends ACK + SDP where SDP has the updated connection
> info(IP and port of endpoint) where media should be sent. Along with this
> it also changes the crypto master key as per RFC due to change in
> connection info(c=).
>
>
>
> On seeing this ACK, FS update the connection info(which is good) and
> change its own crypto master key in response. however this new master key
> is not sent to far end, meaning FS can decode the media it receives but
> other end can't decode the media FS is sending to it resulting in one way
> audio.
>
>
>
> Has anyone come across this issue ?
>
>
>
> Is there any way to trigger Re-INVITE or UPDATE from FS so other end gets
> new master key ?
>
>
>
>
>
> Regards
>
> Prashanth
>
>
>
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