[SIPForum-discussion] Decoding G711 audio

mfc at aol.in mfc at aol.in
Thu May 22 08:16:36 UTC 2008


 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




answer to your 2nd question 


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

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

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
discussion at sipforum.org
Subject: [SIPForum-discussion] Decoding G711 

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 

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 

Warm Regards,
Rajesh R.

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