There are certain advantages (such as better resource & bandwidth
utilization) of doing DTMF digit collection during mid-call using MGCP body
in SIP INFO method. A typical configuration is as follows: A Softswitch
communicates with a SIP application server. The GWs hooked up to a
Softswitch using MGCP can collect and pass multiple digits en block to the
softswitch which can pass it to SIP Application server.
It seems that people have to resort to proprietary solutions to take
advantage of this. At least an Informational RFC (such as, based on the
expired draft-culpepper-sip-info-event-00.txt) would help.
Thanks.
Romel Khan
Ph: (732)-363-0213, x241
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Thursday, August 30, 2001 2:44 AM
To: [EMAIL PROTECTED]
Subject: [Sip-implementors] Sending DTMF digits
Hi ,
Sending DTMF on signalling plane has many uses especially in softswitch
where the softswitch may want to request collection of digits during a
connection without using any special media detection resources. What is the
status of these primitives discussed in draft-kuthan-info-payload-00
especially on reliable and in-order transport of these digits? Is embedding
mgcp bodies no longer valid?
-sumit
Jonathan Rosenberg <[EMAIL PROTECTED]> on 08/30/2001 11:50:04 AM
To: "'Dan Firac'" <[EMAIL PROTECTED]>,
[EMAIL PROTECTED]
cc: (bcc: Subhash Ullal Nayak/HSSBLR)
Subject: RE: [Sip-implementors] How to send DTMF digits?
There is no IETF standard mechanism for using INFO. The preferred approach
is rfc2833.
-Jonathan R.
---
Jonathan D. Rosenberg, Ph.D. 72 Eagle Rock Ave.
Chief Scientist First Floor
dynamicsoft East Hanover, NJ 07936
[EMAIL PROTECTED] FAX: (973) 952-5050
http://www.jdrosen.net PHONE: (973) 952-5000
http://www.dynamicsoft.com
-----Original Message-----
From: Dan Firac [mailto:[EMAIL PROTECTED]]
Sent: Monday, August 27, 2001 7:48 AM
To: [EMAIL PROTECTED]
Subject: [Sip-implementors] How to send DTMF digits?
Hello,
How should I send DTMF digits? Using RTP (RFC2833) or through the INFO
header ?
If the answer is using RTP, where can I find solid documentation for
atributes like 'fmtp', 'rtpmap' for defining dynamic payload types. It will
be usefull for me if you have a SDP message dump for two audio media
streams, one for G723 and other for DTMF, along with the dynamic payload
type definitions for: the redundant type and the telephony-events type.
Thank you,
Dan Firac,
Software Engineer,
+4093260623
Redline Communications
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