How does mediaproxy select the codec to be used when multiple are present? Does it try to use the lowest bandwidth codec first? Is there any way to manipulate this so if it finds 3-4 codecs available, it will use the one specified?
- Daryl
Daryl Sanders wrote:
How does mediaproxy select the codec to be used when multiple are present? Does it try to use the lowest bandwidth codec first? Is there any way to manipulate this so if it finds 3-4 codecs available, it will use the one specified?
It does not select any codecs, it just forwards the rtp packets back and forth.
Andy
Daryl,
MediaProxy relays only RTP/RTCP packets irrespective of the codes negotiated by the end points. So your endpoints select the codec based on SDP offer/answer model and not MediaProxy.
Adrian
On Nov 9, 2005, at 5:38 AM, Daryl Sanders wrote:
How does mediaproxy select the codec to be used when multiple are present? Does it try to use the lowest bandwidth codec first? Is there any way to manipulate this so if it finds 3-4 codecs available, it will use the one specified?
- Daryl
Thanks for the info, and please forgive my ignorance on the subject...
Is there a standard that ATAs uses for codec selection?
Like everyone else, I want to make sure my ATAs (cisco, sipura, linksys) use only lower bandwidth codecs. I can guarantee that my ATA's and my PSTN gateways will all have g729 available, but I want to make sure that mediaproxy force a different codec emulation for any reason.
- Daryl
On 11/9/05, Adrian Georgescu ag@ag-projects.com wrote:
Daryl,
MediaProxy relays only RTP/RTCP packets irrespective of the codes negotiated by the end points. So your endpoints select the codec based on SDP offer/answer model and not MediaProxy.
Adrian
On Nov 9, 2005, at 5:38 AM, Daryl Sanders wrote:
How does mediaproxy select the codec to be used when multiple are present? Does it try to use the lowest bandwidth codec first? Is there any way to manipulate this so if it finds 3-4 codecs available, it will use the one specified?
- Daryl
On Nov 9, 2005, at 6:11 AM, Daryl Sanders wrote:
Thanks for the info, and please forgive my ignorance on the subject...
Is there a standard that ATAs uses for codec selection?
Yes SIP/SDP check the RFCs.
Like everyone else, I want to make sure my ATAs (cisco, sipura, linksys) use only lower bandwidth codecs. I can guarantee that my ATA's and my PSTN gateways will all have g729 available, but I want to make sure that mediaproxy force a different codec emulation for any reason.
You cannot enforce any codec selection with MediaProxy, you can only limit/order the codecs in the PSTN gateway or your user agents.
- Daryl
On 11/9/05, Adrian Georgescu ag@ag-projects.com wrote:
Daryl,
MediaProxy relays only RTP/RTCP packets irrespective of the codes negotiated by the end points. So your endpoints select the codec based on SDP offer/answer model and not MediaProxy.
Adrian
On Nov 9, 2005, at 5:38 AM, Daryl Sanders wrote:
How does mediaproxy select the codec to be used when multiple are present? Does it try to use the lowest bandwidth codec first? Is there any way to manipulate this so if it finds 3-4 codecs available, it will use the one specified?
- Daryl
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Adrian Georgescu -
Andreas Granig -
Daryl Sanders