We are facing Voice Degradation wil using FXO cards in 2610 Routers.
The link is through Frame-Relay Voice PVC (32K CIR) over 256K Access Pipe. The same serial interface carries another PVC for Data (96K CIR).
The Voice PVC doesn't carry any other traffic except voice. We have "not" implemented Frame-Relay Traffic-Shapping.
The Voice quality is really bad in ONE Direction (i.e from location1 to location2). However Voice from location 2 - location 1 is without any problems. And at the same time i do see some FECN (at location 2) and BECN (at location 1) indicating congestion.
1. Has any one experienced Bad Voice quality in only one direction ?
2. Would it help to implement Traffic-Shapping ?
3. What percentage of FECN and BECN is normal ?
4. Is 32K BW enough for 4 FXO ports (4 Voice calls) simulteneously ?
How many total sites are involved, what protocols are you running?
From the math, 32K is not enough CIR to ensure 4 calls proper Bandwidth. At what point is the voice degrading, is is choppy missing message, sound, jitter, echo or after 1, 2 or 3 calls.
Even if you are using G729a, voice packets could be dropped. Not to say that it is here, but look at the FRS stats to see ip packets are being dropped.
Traffic shaping is always recommended, rtp header compression will help, but the trade-off is around a 20% CPU hit.
If you implement traffic shapping , it needs to be done throughout the network as queueing delays related to data on other slow links and at the headend (specifically here) could be the cause of the distortion alone. I would at least try traffic shapping first, then if the problem doen't go away, increase CIR for Voice, if there are still issues, implement LLQ.
You will need to use FRTS. If your voice and data PVC's share the same main interface, the data can clog the pipe. You can look at it lik a freeway with 2 lanes merging. The main pipe is the freeway and the PVC's are the lanes. To give the voice a chance you will need FRTS and FRF12 to improve the quality.
Your steps are correct for implementing this. The fragementation should be 80 per 64k. So with that rule you will have a map-class for data and voice and they will both be fragmented to 80. I would do 2 map-classes since your CIR is different for the PVC's. It will also allow you to expand voice or data seperately if you get more BW down the road. Since you have only 32k CIR for voice I would try the header-compression.
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