I have a Cisco 871 router and a Cisco 7940G IP phone working directly with my ViaTalk line. Here's the VoIP LLQ config on my 871:
class-map match-any qos-call
match ip dscp ef
class-map match-any qos-call_setup
match ip dscp cs3
shape average 436000
service-policy output qos-out_fa4
What I'm not sure about is the priority/bandwidth values. Lets say 75 kbps is needed for the actual call (RTP media stream) and 16 kbps is needed for the SIP signalling for that call. If I'm going to use call waiting (i.e. I'm on a call and a call waiting call comes in), or if I'm 3-way calling, should both those values be doubled?
P.S. Does anyone by chance know how to change the default DSCP settings (for both RTP & SIP) on the 7940? Also, is there a way to set the RTP payload size?
Thanks in advance...