Grandstream phone1 issue

[wingsohot]

Is anyone else having issues with phone1 port on the Grandstream HT-502? No matter which sip port I use for phone1, calls coming in can't hear me, but I can hear them. I plug the phone into phone2 and everything works fine. Every HT-502 I provision gives me this problem on phone1, but not phone2.

[burris]

If you are using a router, try port forwarding 5004-65000 to your Grandstream.
First assign a fixed IP to the GS and specify this IP when setting up the forwarding in the router.

Or, call VOIPo to help you do this..

[wingsohot]

The grandstream is before the router so port forwarding should not be an issue here. Cable modem ----> grandstream------> router

[GreenLantern]

Make sure you use a different port for each line, not the same port.

Other than that, after the 2 lines provision, open the config pages for each line and compare line by line. See what is different.

[wingsohot]

Thanks GreenLantern, have been using different ports, but will compare line by line.

[GreenLantern]

wingsohot, also, as burris mentioned, this is likely a network/firewall/routing issue.

give your ht502 a static ip address, or reservation in your router.

then point ports 5004 through 65000 to that address. that's a bit difficult with some routers, so instead just point the DMZ feature to your ht502's static ip address.

[wingsohot]

Why would I have to do that if I have the ht502 before the router?

[GreenLantern]

If your ISP is providing a true modem, then you probably wouldn't need to mess with it.

But make sure. Because a lot of ISP devices are actually routers, not modems. And you'd need to get through their firewall.