[SIPForum-discussion] Consultation - How to decode G729 (SIP)

[Fernando Mella]

Hi Vinicius,

This topic has many standards and theoretical aspects. 

If you are getting in touch on it at first time, bellow some tips:

- You have two points on media quality.
	- Transport network IP impairments (delay, packet loss, jitter)
	- Application RTP - CODEC Coder/Encoder process (attenuation, pitch, noise, algorithm implementation (hw/sw), etc) 

- What is the target? Identify above items on your solution.

- Suggestions.

- Mirror the traffic end to end.
- Capture RTP and use wiresharck.
- Generate large quantity of calls with audio in both ways an for about 30seg each one. 
- Look if bit rate is constant. 8Kb/s
- Look streams and get de jitter, packet loss and delay.

- See ptime parameter.
- Depending on the scenario NTP can be necessary to keep media synchronous.
- Get app to analyze MOS and R-factor.


See about PESQ Model and E-MODEL. There is an huge information on it. 

Hope have been helpful

Regards
Fernando


On Monday, June 30, 2014 3:37 PM, Vinicio Callejas <vinicio.callejas at gmail.com> wrote:
 


Estimated sip-forum, I have some doubts about decoding codec G729 calls to listen to audio. With the purpose of determining audio problems!.

Best regards,
Vinicio Callejas
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