sundance-communications.com/forum Forums Other TDM Phone Systems Sprint - Tadiran Telephones & Systems IP Phone and FIOS

I got the exact proplem, and about the same question long time back. Talk one way although all the required port had been open already. I didn't use sentinel for external phone, just do open the port and also some with vpn.
Finally Owen help me solved the problem.
What Owen told me was put the Required Zone to 1 instead of the default 0. 0 is the default for the keyset phone.
Im not sure if this will help, but it solved my problem.

yes card was/is set to zone 1. Still didn't resolve the issue. We had a spare 3725 router so made this the head end router, at the remote sites using a combination of 831/871 routers. At first thought this would be a piece of cake will use IP DDNS on the routers, after playing with that a bit so that it would break decided against it, I would be the only one working on these. So instead it is now a requirement for the users that work at home to have a static IP, and we create an IPSec tunnel to each persons house for the phone. I know it sounds pricey and just a lot of work but after pricing this out against bringing in a cable modem or IP T-1 just for VoIP the ROI is 1 year so not a bad trade off. Ended up having a Verizon tech come to site, showed him the problem after 2 hours he ended up saying there were 14 others customers in the area having the same problem...however we do use this same link for other purposes so at $280/month for 150 down and 35 up, yeah i can place a few routers out in the field. thanks for your suggestion though

Still would have went with the Sentinel and saved yourself a TON of headaches and time.

The Sentinel would work if we had several IP phones at one location right? these users all work from home at different places. Curios about the sentinel though never used one and have another application that this may come in handy. is it for an office say that has 20 phones and they can all hide behind one address?

Yes..if it has the bandwidth for those 20 phones. Just makes it nice and neat with one UGW card.