Thanks. I finally resolved my issue with forwarding both SIP and RTP ports without touching the NAT support parameters.xebbmw wrote:Hi all,
I bought recently the VOIP key. After configuring my ATA SPA2102, I was not able to hear the other party voice although I was heard by them. This was happening for incoming or outgoing calls.
My ATA was behind a router (not in DMZ however) and the ports UDP 5060-5061 and 16384-16482 were already forwarded. I tested my VOIP key on a soft phone (3CX) and everything was ok, for outgoing and incoming calls I could hear the other party. After more search on the net I found the following settings which are required if ATA is behind a router:
Voice > SIP
NAT Support Parameters
Handle VIA received = yes
Handle VIA rport = yes
Substitute VIA Addr = yes
Send Resp to Src Port = yes
You may test it yourself to see if it helps. Remember that the problem was only for ATA, soft phone was working fine.
I also could resolve the same issue with connecting the ATA box on the DMZ port or ATA box on the modem with Router behinds the ATA box. But, I preferred the ATA on Router with port forwarding setting.