We have Cisco 2811 with CCME and also act as H.323 gateway for branch VOIP traffic. Cisco IP phones are registered in the router and there's a PRI E1 connection to PSTN cloud from the router. One Service provider offers SIP trunk.
Q1. Is it possible to configure SIP trunk in 2811 and enable calls between H.323, SIP & PSTN?
Q2. If possible, what are the pre-requisities ?
* Additional Resources
Q3. Highly appriciate if someone can provide sample configuration with simple dial peers to enable voice routing between SIP, H.323 & PSTN cloud?