How to make branches call each other

[mohammad saeed]

Hi Guys,

I am newbie with remote site call solution and I have some confusion about this case:

I have HQ installed CUCM and 5 branches with IP phones, I made VPN tunnel between HQ and each branch and can call from branches to HQ but no sound I mean can ring but no voice! what is the problem here? and what if I want to let every branch call each other?

Thanks for all

[balaji.bandi]

Most of the time Oneway voice most of the time NAT issue here.

https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/5219-fix-1way-voice.html

You want each branch call each other, they need to register (kind of SIP Trunking each other ) and make dial rule for that extention to route the call to using using SIP Trunk.

[mohammad saeed]

I forgot to say that i don't have VG in each branch only have firewall ! will this be the reason?

[Dennis Mink]

take the ip of one phone that has no voice to the other and see if you can ping between the two. check routing exist from phone to phone. check if RTP is allowed in any access-list in the path, this problem is fairly common