I have a connection to ISP by SIP. My phone 7940 SCCP registereg on my 2811 CCME 4.1 So, I configured sip-ua authetication, assign ISP-number to my phone, configure registation server, BUT - I don't know how to configure sip proxy. My ISP requred to use sip proxy to all calls. When I call to outside trought sip, I see that replyes rtp packets go not from proxy, so - I have one-way voice issue. Problem that I can'nt see an other host - just proxy. So, I need get rtp-packets from proxy only.
dial-peer voice 6 voip
session protocol sipv2
session target sip-server
fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback none
authentication username xxx password xxx
registrar ipv4:192.168.128.41 expires 3600
My sip-proxy is 192.168.128.41
How can I configure 2811 to call trought sip proxy?