[OpenSIPS-Users] detect_hold()

[Bogdan-Andrei Iancu]

Hi Iñaki,

Thanks for heads-up :) .

In this case, we can simply check the SDP for the "sendonly" occurrence, 
right?

Regards,
Bogdan

Iñaki Baz Castillo wrote:
> 2010/7/6 Bogdan-Andrei Iancu <bogdan at voice-system.ro>:
>   
>> Hi Jesse,
>>
>> A re-INVITE putting a call "on hold" has IP 0.0.0.0 in the SDP (c line)
>>     
>
> Hi bogdan, such mechanism (putting 0.0.0.0) is deprecated and just
> valid according to RFC 2543 (old SIP RFC):
>
>
> RFC 3264:
>
> 8.4 Putting a Unicast Media Stream on Hold
>
>    If a party in a call wants to put the other party "on hold", i.e.,
>    request that it temporarily stops sending one or more unicast media
>    streams, a party offers the other an updated SDP.
>
>    If the stream to be placed on hold was previously a sendrecv media
>    stream, it is placed on hold by marking it as sendonly.  If the
>    stream to be placed on hold was previously a recvonly media stream,
>    it is placed on hold by marking it inactive.
>
>    [...]
>
>    RFC 2543 [10] specified that placing a user on hold was accomplished
>    by setting the connection address to 0.0.0.0.  Its usage for putting
>    a call on hold is no longer recommended, since it doesn't allow for
>    RTCP to be used with held streams, doesn't work with IPv6, and breaks
>    with connection oriented media.
>
>
>   


-- 
Bogdan-Andrei Iancu
OpenSIPS Bootcamp
20 - 24 September 2010, Frankfurt, Germany
www.voice-system.ro