IP Phone connected to Remote PBX, can use phone but NO SOUND??

[MysteryPhantom]

I have connected an NT343 handset from my home to the office NCP500 pbx. I have the phone up and running. I can use all the keys and program the system form the handset but ... I can't hear any sound.

When I pick up the phone I get an internal dial tone but as soon as I pick up an external line there is no dial tone, however ... I can dial the number and my mobile for instance will still ring. Answer it, call connects but no sound can be heard both ways.

I'm not sure if this is happening with internal extensions as nobody is in the office to test it.

Please help ...

 

[obtsystems]

You will need a vpn for it to work. there is ways by opening ports, and doing NAT, but a VPN is the best way

 

[MysteryPhantom]

Thanks for the response. I can't set up a VPN as it would mean changing every users router. This can't be done. I have managed to get the phone working but just no speech. Does anybody know if there is an extra port that needs to be open for the speech protocol?

This can be done without a VPN I have known of it to be done before it's just the VPN is the easy option.

Please help.

 

[obtsystems]

if it is only 1 phone you will only need to change the router in the office and in your house. It will save you a whole lot of problems.

If every user is getting a phone there is no other way

 

[atcom]

Look in the programming to see what RTP ports are being used. You will have to open that range on both routers.

-----------------------------------
Telephone & computer wiring/Cat 5E/Cat 6/Fibre Optic cabling in Calgary, AB

 

[MysteryPhantom]

I have also done this but without luck. Any more suggestions?

 

[obtsystems]

You would have to do more than open ports. You will need to have nat translation on the routers with port trigger 5060 to 35060

 

[MysteryPhantom]

Can you explain more on how to do this please? As from what I have done, it's already done.

 

[montyzummer]

As an industry standard ports 1718, 1719 & 1720 are utilised for H323 connectivity , is there a firewall on or sat behind the routers inspecting packets??

Really easy way to test this is to get youre self a hub(NOT A SWITCH), run a programm called wireshark with the system the IP phone and youre lap top plugged into the hub and filter the results in wireshark to H323 or IP addresses, this will provide you with a comprehensive breakdown of network traffic and if any what ports are causing issues.

If you need any advice on the set up let me know and i will point you in the correct direction, also if you are port forwarding disconnect everything else from the network except the PBX, HUB, Laptop , granted this will cause some disruption but stick to youre guns and explain to customer this is necessary as its all to easy for them to blame you...however if you can prove an external influence is causing the issue all will be good.

Keep us posted

APSS (SME)
ACSS (SME)

 

[MysteryPhantom]

MontyZummer ... I will try the Wireshark route. How do you configure the program to filter certain IP's though? and the external connection?

 

[montyzummer]

Open wireshark and goto capture / options in there make sure you select the interface as youre IP address of youre local NIC Card.

Youre capture filter is where you set the capture option , be it IP Address / ports or both , the following link shows you how to maniplulate the filter,

http://wiki.wireshark.org/DisplayFilters.

Start on the front end of the router make a call and see what traffic hits , then go on the back of the router and do the same test(Will show you what is not getting through).

I also agree with atcom , check youre RTP ports first as the phone is registering so you can be 99% it is RTP traffic being blocked , but wireshark will confirm .


APSS (SME)
ACSS (SME)