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

[ashok.pitambar at wipro.com]

Yes Arnab , you are right 
 
The RFC 3264 (offer/answer)( http://www.ietf.org/rfc/rfc3264.txt  )
sections
 
1 .8.2 Removing a Media Stream
2. 8.4 Putting a Unicast Media Stream on Hold
 
RFC also specifies about use of port 0 in as "Of course, when used, the
port
   number MUST NOT be zero, which would specify that the stream has been
   disabled" please check 8.4 Putting a Unicast Media Stream on Hold
section.
 
 
Regards ,
ASHOK PITAMBAR
Wipro-Nortel Multi-Media Applications
Electronics City I, Tower 2, 1th Floor, B Wing, Bangalore - 560 100
Mob: +91-9008122004 |  Ph: +91-80-4122 1111 Ext.:2162 |  ESN:8696 
Email: ashok.pitambar at wipro.com <mailto:ashok.pitambar at wipro.com>  |
Website: www.wipro.com
<file:///C:/Documents%20and%20Settings/raghunath/Application%20Data/Micr
osoft/Signatures/www.wipro.com> 
 
 

________________________________

From: Arnab Biswas [mailto:arnabbiswas1 at gmail.com] 
Sent: Monday, January 12, 2009 9:29 AM
To: Ashok Pitambar (WT01 - Telecom Equipment)
Cc: Srinivas Banda (WT01 - Telecom Equipment); discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Can we specify (m = audio 0 ..) audio
port aszero for hold scenario.


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/adb0916f/attachment-0002.html>