we got 2 sites, say Site A & site B. On site A, our CM is located [4.1(3)] and the site B is connected to it w/ only srst.
Now when the user is having a conversation bet Sites that reach 1 hour or more, the voice quality is becoming garble (like robot). But when the call is w/in the site, no issue on quality even if it's longer.
We are using cisco 3845 (A) & 3825 (B) & using G.729 bet sites. W/in sites, G.711 is used.
Could you give me a detailed call path of the audio, with device names, etc. So we can determine if a sniffer trace would be beneficial in solving the problem. Also how are the messages garbled? Echo, jitter, dropouts, etc? Also what IOS ver are you running?
If you have MPLS the class of service cross at the other side, so you can check if you see voice packets marked with the command show policy-map interface XXXXXXX
maybe you have 2 policy-map created one inbound aplied in Fastethernet or GigabitEth to mark voice and data packest and other aplied in WAN Interface for assure the QoS in the Network, where, you must be have configured the voice class with priority command in percent or BW (To use Priority Queue), and ensure that you don't have dropped packets.
If you have bandwidth command (percent o BW)configured for voice in policy map you use the standart queue and this not works fine for voice quality
And finally check if you have the bandwidth command configured in the wan interface.
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