Re: [Opalvoip-user] G722 SDP problem
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Re: [Opalvoip-user] G722 SDP problem
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From: Eugene M. <em@HERMONLABS.com> - 2009-04-26 14:53:51
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Greetings, Robert!
I've looked at G722 code in 3.6.1: you configure plugin for 8kHz. I this case I doubt that G722/16000 will be accepted. I'll experiment on that tomorrow.
Eugene Mednikov
SW Development Group Leader
Hermon Laboratories TI Ltd.
Hatachana St., POB 23
Binyamina 30500 Israel
www.hermonlabs.com<http://www.hermonlabs.com/>
Phone: +972 4 626 8422
Mobile: +972 54 452 0187
Fax: +972 4 626 8498
em...@he...
From: Eugene Mednikov [mailto:em@HERMONLABS.com]
Sent: Sunday, April 26, 2009 12:44 PM
To: 'Robert Jongbloed'; opa...@li...
Subject: Re: [Opalvoip-user] G722 SDP problem
Greetings, Robert!
We use OPAL 3.4.4. Will try 3.6.1...
Can't provide logs right now, maybe tomorrow.
Eugene Mednikov
SW Development Group Leader
Hermon Laboratories TI Ltd.
Hatachana St., POB 23
Binyamina 30500 Israel
www.hermonlabs.com<http://www.hermonlabs.com/>
Phone: +972 4 626 8422
Mobile: +972 54 452 0187
Fax: +972 4 626 8498
em...@he...
From: Robert Jongbloed [mailto:ro...@vo...]
Sent: Friday, April 24, 2009 2:53 AM
To: opa...@li...
Subject: Re: [Opalvoip-user] G722 SDP problem
I am sure this was fixed some time ago. OPAL should understand both.
What version are you using?
Can you provide log files where it is not working?
Robert Jongbloed
OPAL/OpenH323/PTLib Architect and Co-founder.
From: Eugene Mednikov [mailto:em@HERMONLABS.com]
Sent: Friday, 24 April 2009 12:10 AM
To: 'Robert Jongbloed'; opa...@li...
Subject: RE: [Opalvoip-user] G722 SDP problem
Greetings, Robert!
Even if G722/8000 is correct OPAL still does understand only G722/16000 payload. I assume that something might be done in codec definition.
Eugene Mednikov
SW Development Group Leader
Hermon Laboratories TI Ltd.
Hatachana St., POB 23
Binyamina 30500 Israel
www.hermonlabs.com<http://www.hermonlabs.com/>
Phone: +972 4 626 8422
Mobile: +972 54 452 0187
Fax: +972 4 626 8498
em...@he...
From: Robert Jongbloed [mailto:ro...@vo...]
Sent: Thursday, April 23, 2009 2:40 PM
To: opa...@li...
Subject: Re: [Opalvoip-user] G722 SDP problem
Actually G722/8000 is the correct value.
This from RFC3551
4.5.2 G722
G722 is specified in ITU-T Recommendation G.722, "7 kHz audio-coding
within 64 kbit/s". The G.722 encoder produces a stream of octets,
each of which SHALL be octet-aligned in an RTP packet. The first bit
transmitted in the G.722 octet, which is the most significant bit of
the higher sub-band sample, SHALL correspond to the most significant
bit of the octet in the RTP packet.
Even though the actual sampling rate for G.722 audio is 16,000 Hz,
the RTP clock rate for the G722 payload format is 8,000 Hz because
that value was erroneously assigned in RFC 1890 and must remain
unchanged for backward compatibility. The octet rate or sample-pair
rate is 8,000 Hz.
Robert Jongbloed
OPAL/OpenH323/PTLib Architect and Co-founder.
From: Eugene Mednikov [mailto:em@HERMONLABS.com]
Sent: Thursday, 23 April 2009 5:58 PM
To: 'opa...@li...'
Subject: [Opalvoip-user] G722 SDP problem
Greetings!
There are many SIP phones that erroneously send
a=rtpmap:9 G722/8000
instead of
a=rtpmap:9 G722/16000
in SDP. In this case OPAL doesn't find G722 codec with 8kHz sample rate.
Any ideas how to fix that?
Eugene Mednikov
SW Development Group Leader
Hermon Laboratories TI Ltd.
Hatachana St., POB 23
Binyamina 30500 Israel
www.hermonlabs.com<http://www.hermonlabs.com/>
Phone: +972 4 626 8422
Mobile: +972 54 452 0187
Fax: +972 4 626 8498
em...@he...
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