[SIPForum-discussion] Can we specify (m = audio 0 ..) audio port aszero for hold scenario.

[Arnab Biswas]

As per as RFC 3264, you can put on hold by setting the IP address to
"0.0.0.0" of the c line. Otherwise, you may set an attribute
a=sendonly or inactive. I am not aware of any RFC which suggests to set the
port of m line to zero for performing the hold operation.
The port of m line is set to zero to reject that particular kind of media
during the offer answer negotiation.

Thanks,
Arnab

On Sun, Jan 11, 2009 at 11:33 AM, <ashok.pitambar at wipro.com> wrote:

>  Hi Srinivas,
>
>     Thanks for your input, do you have any idea which of SIP or SDP related
> RFC's specify this kind of hold? Is this is responsibility of sip stack to
> take care this kind of hold scenario.Because in our case MG(Media Gateway)
> is replying with 510 protocol error for MGCP message(MDCX) with m = audio 0
> ..& hence sip with 4XX response.
>
> Thanks,
> Regards,
> Ashok Pitambar
>
> ------------------------------
> *From:* Srinivas Banda (WT01 - Telecom Equipment)
> *Sent:* Fri 1/9/2009 11:33 PM
> *To:* Ashok Pitambar (WT01 - Telecom Equipment)
> *Subject:* RE: [SIPForum-discussion] Can we specify (m = audio 0 ..) audio
> port aszero for hold scenario.
>
>  Apart from port 0, you should change the media attribute to
> "inactive/sendonly". sendonly will be used if you have music on hold option.
>
> Regards
> Srinivas
>
>  ------------------------------
> *From:* discussion-bounces at sipforum.org [mailto:
> discussion-bounces at sipforum.org] *On Behalf Of *ashok.pitambar at wipro.com
> *Sent:* Friday, January 09, 2009 2:57 AM
> *To:* discussion at sipforum.org
> *Subject:* [SIPForum-discussion] Can we specify (m = audio 0 ..) audio
> port aszero for hold scenario.
>
>  Hi All,
>
> By setting the audio port to zero in reinvite , will it invoke hold?
>
> call folw:
>
> A                       B
>   ----INV------->
>  m=audio 29590..
>  < ------200------------
> m=audio 4100..
> --------ACK----------->
>    call established
>
> ---------INV-(hold)---->
> c=IN IP4 0.0.0.0
> m=audio 29590..
> a=sendonly
> <----------200------------
>  m=audio 4100..
> ----------ACK---------->
>
> ---------INV--(hold)----->
>  c=IN IP4 0.0.0.0
> m=audio 0...
> a=inactive
>
>
>
> Regards ,
> ASHOK PITAMBAR
>
>
>
> _______________________________________________
> This is the SIP Forum discussion mailing list
> TO UNSUBSCRIBE, or edit your delivery options, please visit
> http://sipforum.org/mailman/listinfo/discussion
> Post to the list at discussion at sipforum.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20090112/a1fadc19/attachment-0002.html>