NS700 remote IP Phones 1

[bigglesnz11]

I have a customer using a NS700, they have an off site office where I have 4 NT-551 phones
Recently they started having issues where there was no speech path when calling from NT-551 to NT-551 at the remote site, they can call other extensions physically connected to the NS700 and calls to Outside parties are OK as well. I had their IT people swap the router at the remote end and now have more issues, out of the 4 remote phones I can only get 1 to register to the NS700, even if I take all phones OUS and then Bring INS the same phone is the only one that registers
I have brought 2 phones back to our office and they both register ok here and speech is OK
Which would tend to point at the router at the remote end, I suspect port issues, but not sure which to check
TIA

 

[obtsystems]

you have to setup the media relay on the system with the fixed ip address or your wan on main site

you have to setup the 4 phones on the ip extension card as remote phones

on the router you need to have ports 9300 and 2727 forwarded to the system IP
ports 16000 to 16511 to the system dsp card ip ( all ports are udp) if you can only allow your remote office in on these ports

the remote router should not need any settings.

Make sure all sip helpers and alg settings are disabled