Do you have QoS running in your routers? If you do, check to see if packets are dropped for the Voice class and increase allocated bw for this class. If you don't have QoS running, I recommmend that you implement it to prioritize voice packets.
I implemented LLQ out the EI data (toward the other CME) on each side of that E1 128Kb/s by the way. Working VOIP calls with G729r8 in between CMEs, I have made a Priority class in a policy reserving a strict priority of 96 Kb/s (the maximum available Bandwith by default).
Having the link bandwith below 768 Kb/s, I also configured PPP Multilink on each side for fragmentation with fragment size of 10s (to have minimum delay garanty in case of unwanted FTP transfert on the E1)
I have'nt check yet if I had drops during simultaneous talk..
I'll do it shortly and give you my feedback
The wierd thing is that the choppy voice symptom appears only when simultaneously talking and only in this case. It's pretty strange to me.
I was thinking maybe VAD coul be involve in this issue. Could VAD (when misconfigured)impact a voice conversation the way I described it ?
I suppose that VAD can be an issue if not configured properly. The link from my previous post has a section talking about VAD, so you might want to take a look at it. As a test, you can try disabling VAD in your router to see if the problem goes away.
I don't have VAD in use in our enviroment, and everythign is working fine.
This document is an early notification of a behaviour change that will be introduced in IOS XR release 6.5.
IOS XR configuration principles relevant for this article are:
On router platforms all interfaces must be by defaul...
With XR 4.2.0 the ASR9000 is releasing a new line of hardware models. This amongst others is the RSP440, the next generation RSP with faster switch fabric along with Typhoon based Linecards, the next generation network processor.
The Cisco EPN system incorporates a network architecture designed to consolidate multiples services on a single Multiprotocol Label Switching (MPLS) transport network. This network is designed primarily based on Application ...