[SIPForum-discussion] Decoding G711 audio

Thu Jun 5 14:11:16 UTC 2008

Hi Rajesh,

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 API/Functions?
I would like to answer 3rd one, well first of all its up to implementation of registrar. Some of them has been developed with their own embedded applications for showing all registered users. If you want to get information about registeterd user it is up to registrar. Lets say there is no embedded applciation inside the code then you need to access DB of registerar because at least all of the registrars have to keep these infos inside the DB. Then I would suggest you a script that access db and get a query.

On the other side if you want to now amounts fo registered users almost all of the registrars have their own snmp database so if you have a snmp counter browser something like that you will be able to get it.
Selamlar,Halit Sakca

To: malcolm at c3.co.ukDate: Thu, 22 May 2008 04:47:32 -0400From: mfc at aol.inCC: discussion at sipforum.orgSubject: Re: [SIPForum-discussion] Decoding G711 audioI thank you for your valuable information and time, Mr. Malcom. I've selected the SIP INFO message way of doing this. Thanks again and I really appreciate your help. There's just the third question left unanswered and I'm hoping that someone would answer that too. :-)Rajesh R.
-----Original Message-----From: Malcolm Howlett <malcolm at c3.co.uk>To: discussion at sipforum.orgSent: Thu, 22 May 2008 1:33 pmSubject: Re: [SIPForum-discussion] Decoding G711 audio

From: mfc at aol.in [mailto:mfc at aol.in] Sent: 22 May 2008 06:26To: discussion at sipforum.orgSubject: [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.
Well at a minimum there are lots of people who do hardware cards with DSPs that do it. Aculab, Pika technologies are 2 companies that spring to mind, not a cheap alternative
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?

Any one of (and indeed combination of) 3 ways
In band audio – dependant on the audio codec as some of them can’t carry it
RFC2833 – negotiated in SDP
SIP INFO messages3. 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 API/Functions?

I thank you all for your time. I appreciate it.Warm Regards,Rajesh R.

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