[SIPForum-discussion] Decoding G711 audio

Beith, Gordon GBeith at empirix.com
Thu May 22 13:15:26 UTC 2008

4733 is adequate for what is beign discussed here....



From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Anthony Orlando
Sent: Thursday, May 22, 2008 5:28 AM
To: srinivas.banda at wipro.com; mfc at aol.in
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Decoding G711 audio


2833 has been superseded by 4733 and 4734.

--- On Thu, 5/22/08, mfc at aol.in <mfc at aol.in> wrote:

From: mfc at aol.in <mfc at aol.in>
Subject: Re: [SIPForum-discussion] Decoding G711 audio
To: srinivas.banda at wipro.com
Cc: discussion at sipforum.org
Date: Thursday, May 22, 2008, 4:16 AM


Hi Srinivas,

Thank you very much for your reply. I appreciate it.

Rajesh R.


-----Original Message-----
From: srinivas.banda at wipro.com
To: mfc at aol.in
Sent: Thu, 22 May 2008 12:03 pm
Subject: RE: [SIPForum-discussion] Decoding G711 audio


Hi Rajesh,


answer to your 2nd question is:


you can transmit DTMF tones over sip through INFO messages(which is
called out of band signalling).

and another way is thorugh RFC-2833(RTP Payload for DTMF Digits,
Telephony Tones and Telephony Signals)

I hope this information will help u ..








From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of mfc at aol.in
Sent: Thursday, May 22, 2008 10:56 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Decoding G711 audio

Hello all,

I have a few queries and I am totally new to VoIP.

1. Is there a way to convert G711 (both alaw and mulaw) back to PCM? I
searched through the internet and am still searching, but I thought I
will put up this query to you people as someone might have experienced
this problem already.

2. How are DTMF tones transmitted over a SIP call? If I dial say 34 when
a call is mature, how is this tone sent to the other end? What are the
commands used? Is it sent as a MESSAGE?

3. Is there a way to retrieve all the registered client information (the
client extension and ID/name) from the SIP Server/Registrar? Is this
possible? Can you provide me some leads to a program or some

I thank you all for your time. I appreciate it.

Warm Regards,
Rajesh R.


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