[asterisk-users] Softphone RTP Jitter

[Fernando Berretta]

Hi,

I'm having problems with audio coming to my asterisk PBX from eyebeam 
softphone running on Windows XP machine, it has a lot of Jitter. I've 
taken a lot of tcpdumps from Asterisk machine and jitter comes only from 
softphones, audio comming and going to gateways, IP phones, etc has no 
jitter. We have installed other softphones with same result, seems the 
problem is in windows machine, if I ping asterisk ip all packets are 
back <1ms so.. doesn't seems to be a network problem. I've tried also 
with 2 different audio cards, one pci and one plantronics usb and 
problem is still there, as a work around I've forced asterisk to use a 
JitterBuffer of 100ms and all goes well, but I would like to find out 
why packets from softphone are arriving with jitter.  Has someone had a 
similar problem ? any help would be appreciated.

Best Regards,
Fernando