we apology for any inconvenience. Did you connect Cisco ATA direct to modem? or direct to other router? If Cisco ATA direct connect to modem, modem in bridge mode? or router/modem mode?
If unit direct connect to modem act as router the firewall in router will drop connection with phone provider as well as if you connect it direct to router, If you want resolve firewall issue you need configure port forwarding to ATA. for SIP and RTP, Also Ask your phone provider about this following.
1- SIP port number
2- RTP port number
3- SIP keep alive timer
4- Dial plan
5- of course correct proxy server, username, and password.
after you get all this following information from phone provider and you still get same issue please give us call at 1-866-606-1866 make sure have unit srial number ready and cisco userID.
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