Confused and need your expert input in this regards
SITE A is HeadQuarter and Site B is a branch. Setup looks like this :-
Site A calling Site B
IP Phone Network(SiteA)--->CCM5.x (SiteA)-->LAN NetworkA--> WAN RouterA--> WAN RouterB-->Branch LAN Network-->CCM5.x(SiteB)--> IP Phone Networks(Site B)
The issue is :-
1) Site B don't want to route IP Phone network over WAN
2) Only CCM network routing is allowed
3) Open for any trunking except SIP.
Tried INTERCLUSTER TRUNK but here needs to advertise each other network and need to make it mesh which is not scalable in case branch has 1000+ phone then needs to route 8+ network which is not scalable and also not the best option from security aspect.
Gateway acting as a proxy is a option but still worried about RTP traffic.
Looking towards input here and thank you all in advance .
With best regards