Remote SIP phones

[Tom Mazzotta]

I'm trying to get remote SIP phone (Grandstream GXP2000) to work with the Askozia pbx deployed in my office. In my config, both the pbx and remote phone are behind NAT's at their respective locations. I'm port forwarding UDP 5060, 4569 and 10000-10200 to the static (private) IP's of both my pbx and phone by their nat devices. Using a Zoiper softphone at the remote location works perfectly fine, I can call extensions/outside-lines on the pbx and receive inbound calls from the pbx. The remote SIP phone behaves as follows:
1. I can connect to the PBX only when I don't use a password. Any password (even a single character) prevents the phone from registering with the pbx.
2. When the phone registers, I see a "red" dot next to the phone definition on the accounts_phones.php page, indicating that the phone is "unreachable"
3. SIP SHOW PEERS, displays: (IP obscured)
107/107                    xxx.xxx.xxx.xxx      D   N      1024     UNREACHABLE
4. The phone works fine when I call extensions or lines on the PBX, however, I can't receive any inbound calls to the phone.

Any ideas? 

[Facundo Ameal]

Tom,
    Take a look at into the Grandstream configuration, you can setup it to use a static port for SIP communication. If I remember well, the default option uses a random port. That could be one of the reasons. Also, you can try with

Code:

qualify = yes

in Askozia PBX, so the port from which the GS registers remains open.

Hope it helps.

Cheers.