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VoIP over VPN S2S

Hi everyone,

I am trying to establish VoIP call over site-to-site VPN. In every site i have WIN XP with Cisco IP Communicator, emulated Cisco router 3725, on which i have already configured telephony service (CME), and ASA 5520 firewall. I have successful ping from host "MOSTAR_XP" to "RIJAD_XP", and so i know that my S2S VPN is working. My question is: is this topology enough for establishing remote call from one site to another through ASA's (5520)? If yes, what do i need to configure on ASA to have successful call using just configured routers as CME's? If not, then what do i need to include in topology (perhaps CUCM) and how to configure it? Scheme of GNS3 topology is in attachment.

Thanks in advance

Kindest regards

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