1 Aug
2005
1 Aug
'05
8:06 p.m.
Scenario:
IP Phone --> SIP Server --> Asterisk --> (Voice Mailbox)
(G723.1, G729) -> (GSM) -> (GSM, G729) GSM coded file
Is ipphone with codec g723.1 and g729 cabable to retrived voice mail from
the above picture?
If not, please explain a little more.
Thanks a lot.
1 Aug
1 Aug
9:01 p.m.
Innocent Evil wrote:
IP Phone --> SIP Server --> Asterisk
--> (Voice Mailbox)
(G723.1, G729) -> (GSM) -> (GSM, G729) GSM coded file
The SIP server (if it's a proxy like SER) doesn't matter for codec
negotiation, because it just does the SIP signalling.
So if your phone supports G.723.1 and G.729, then Asterisk has to
support one of these (for G.729 you need a license from Digium, G.723.1
is only supported in pass-thru-mode AFAIK, so not usabe here).
Andy
9:21 p.m.
Thanks for answering, Andy.
So the key point is, both end need to have same codec supported. It doesn't
matter how many system/server/broker are between those two end, right?
Thanks again..
-----Original Message-----
From: andreas.granig(a)inode.info
Sent: Mon, 01 Aug 2005 20:01:19 +0200
To: innocent.evil(a)inbox.com
Subject: Re: [Serusers] codec question
Innocent Evil wrote:
IP Phone --> SIP Server -->
Asterisk --> (Voice Mailbox)
(G723.1, G729) -> (GSM) -> (GSM, G729) GSM coded file
The SIP server (if it's a proxy like SER) doesn't matter for codec
negotiation, because it just does the SIP signalling.
So if your phone supports G.723.1 and G.729, then Asterisk has to
support one of these (for G.729 you need a license from Digium, G.723.1
is only supported in pass-thru-mode AFAIK, so not usabe here).
Andy
9:43 p.m.
Innocent Evil wrote:
So the key point is, both end need to have same codec
supported. It doesn't
matter how many system/server/broker are between those two end, right?
Well, all systems between, which decode the RTP stream on one call leg
and encode it on the other one (like session border controllers, PSTN
gateways etc.), have to support the codec of their peer on the
corresponding call leg.
If they are pure SIP proxies, they don't get involved into the codec
negotiation.
Andy
7053
days inactive
7053
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3 comments
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Andreas Granig -
Innocent Evil