Subject: RE: [Megaco] about ReserveValue

From: "Kevin Boyle" <[email-masked]>
Date: Sat, 30 Jul 2005 11:36:26 -0400

I disagree.  There are two payload formats specified in this SDP: 8
(G.711a) and 97 (dynamically assigned to RFC2833 event detection).
Therefore, there are two property values.  If you want both to be
reserved for the stream, RV needs to be set to ON.  With RV set to ON,
the MG is obligated to reserve resources for both payload formats if it
can.  With RV set to OFF, the MG is free to pick one and discard the
other.  RG would only apply if there were multiple property groups,
i.e., multiple m= lines.

Kevin

-----Original Message-----
From: [email-masked] [mailto:[email-masked]] On Behalf
Of Maridi R. Makaraju (Raju)
Sent: Thursday, July 28, 2005 9:33 AM
To: Neal Zhu; [email-masked]
Subject: RE: [Megaco] about ReserveValue 

Neal,

> i have a doublt.in this message
> MEGACO/1 [182.20.20.1]:2944
> T=369361899{C=${A=A1{M{O{MO=IN,RV=OFF,RG=OFF}},E=369098762{tonedet/std
> {tl=*},al/*},SG{}},A
> =${M{O{MO=RC,RV=OFF,RG=OFF},L{v=0
>
> c=IN IP4 $
> m=audio $ RTP/AVP 8 97
> a=ptime:20
> a=rtpmap:97 telephone-event
> a=fmtp:97 0-15
> }}}}}
>
> mgc wants a audio call using G.711 and support RFC2833 to detect DTMF 
> at the same time . what is the correct value of ReserveValue ?
> ON or OFF??

It should be OFF. The reason is as follows:
The H.248 spec says...
"If the value of a Reserve property is True, the MG SHALL reserve
resources for all alternatives specified in the Local and/or Remote
descriptors for which it currently has resources available."

The "alternative" should be applied to each type of resource, i.e. audio
codecs, DTM etc.
For DTMF there is no alternative, it's just RFC2833. So MG should
allocate resources for
RFC2833 if available and return payload 97 in the response. If no
RFC2833(DTMF) resources available then it should omit payload 97 in the
response.

Thanks
Raju

>
> _________________________________________________________________
> Ãâ·ÑÏÂÔØ MSN Explorer:   http://explorer.msn.com/lccn/
>
>
> _______________________________________________
> Megaco mailing list
> [email-masked]
> https://www1.ietf.org/mailman/listinfo/megaco
>

_______________________________________________
Megaco mailing list
[email-masked]
https://www1.ietf.org/mailman/listinfo/megaco

_______________________________________________
Megaco mailing list
[email-masked]
https://www1.ietf.org/mailman/listinfo/megaco