I am running into an issue at customer site which is going on for over 30 days.
They have consistent voice quality issue with 7921 phones.Have checked their phone webpage and see that jitter value increases to 500 during issue. Sometimes I see tcpretransmissions too,
They have QoS but that doesnt seem to help.
I have even collected sniffer off wireless but not able to play due to wireless header.
Have worked with TAC but they do not find any thing conclusive.Can anyone pls tell me what else can be done to analyse and fix the issue