Hello, I have a remote site with a 3745. All the IP phones at that site register to a CM at the main site. So, outside calls come in on a BRI to the 3745, are PLARed to the CM across a WAN. The CM has a CTI Rt Point to the Unity AA. Sometimes, the outside callers here a robotic or synthetic voice during a little choppyness when the AA is playing. It doesn't happen all the time but enough to cause complaints.
When I do a show call active voice on the 3745, it shows gapfills and late packets. I always get that when I hear the synthetic voice. The call does go to the main site through a 6608 blade and I found a bug, CSCdx36894, which is applicable to CM ver 3.1.x. We are using CM 4.1.3 sr3a, Unity is 4.0.4 sr1. What else can I adjust to fix the synthetic voice? Thanks.
GapFillWithSilence=950 ms *
GapFillWithPrediction=1980 ms *
ReceiveDelay=29 ms *
6608 module in switch:
Switch> (enable) show version 2
Mod Port Model Serial # Versions
--- ---- ------------------- ----------- --------------------------------------
2 8 WS-X6608-T1 SAD08140840 Hw : 1.5
Fw : 5.4(2)
Sw : 7.4(3)
HP1: D00404000022; DSP1: D0054322 (4.3.222)
HP2: D00404000022; DSP2: D0054322 (4.3.222)
HP3: C00104000001; DSP3: C002E031 (3.3.2)
HP4: C00104000001; DSP4: C002E031 (3.3.2)
HP5: C00104000001; DSP5: C002E031 (3.3.2)
HP6: C00104000001; DSP6: C002E031 (3.3.2)
HP7: C00104000001; DSP7: C002E031 (3.3.2)
HP8: C00104000001; DSP8: C002E031 (3.3.2)
do "clear counters" on both 3745 at the same time. Then the next day, or after experiencing voice quality issue, check the packets counter from "show atm pvc x/y" again on both routers. If output to input differs, the issue is there and you need to configure ATM and QoS properly.