I have a CUCM 9.1 installed on HQ abd I have sites the connected via site to site VPN with HQ only (The site are not connected together only with HQ).
I configured phones and registered the to the HQ CUCM and I call do calls between the HQ and the sites. The issue that when I tried to call between the sites itselves the phone is ringing but when answering we cannot hear the voice from the both ends.
I configured a site to site VPN between two sites everything works normally I can do a calls between the connected site (VPN).But if I have 10 sites in this case I have to do a site to site VPN between all the sites.
ok but the sites phones are registered to the CUCM so when I do call between the sites the CUCM will open a Tunnel between the phones (the CUCM can ping the phones of different sites) this what I understood
CUCM can ping phones at branches because of existing vpn tunnel from HQ to every branch.
And CUCM can't open a tunnel between sites - cucm will do signaling between phones on different sites but after call setup phones speaks directly to each other so you must have a proper routing for that. In your case - proper vpn tunnel...
That's why you hear ringing but no voice - when it comes to directly speak of voice you have no vpn for that...
on cme you are using dial-peers with "session target..." command and for that target you have functional routing - ie you can actually reach that destination on L3. That's the reason it's working...again I don't know your environment.
Check your routing in details on CME setup and your CM setup - they are not the same 100%. There you will find why this is not working.
You don't have VoIP problems there - you have routing problems and you must solve completely routing and after that voice is going to work just fine...
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