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Last Updated: 06/12/2012
If you have setup a remote extension and the handset can recieve calls, but there is no sound when answered. A firewall/router on the talkswitch system side or on the remote extension side is blocking the RTP packets used to transfer the voice signal. 

Note: SIP ALG, if supported by the firewall/router, should be Disabled at both locations 

Configuring the router 
The Router Port Forwarding area of the IP Configuration page displays the type of gateway device (i.e. the type of router), the IP address of the gateway (i.e. router), and whether router configuration is required. 

A router is a gateway between the local area network and the Internet. Most routers have a firewall to block unwanted data from the Internet. For voice data to reach the TalkSwitch system through the firewall, port forwarding is required. Port forwarding allows the router to map ports to the IP addresses of the TalkSwitch units. Valid Internet data will use the ports to go through the firewall to the TalkSwitch units. 

If you are setting up external IP extensions, a TalkSwitch VoIP network, or a VoIP service that doesnít handle port forwarding, port forwarding is required. If port forwarding is required, and your router supports uPNP (Universal Plug and Play), ensure uPNP is enabled. The TalkSwitch system will use uPNP to automatically set up port forwarding, and the Automatic (uPNP Enabled) link will appear. No router configuration is required.

If port forwarding is required but your router doesnít support uPNP, or automatic port forwarding doesnít work, the Manual Port Mapping Required link will appear. You will need to configure the router as described below. 

1. Select the IP Configuration page in the talkswitch system configuration. 

2. If required, click the Manual Port Mapping Required link. The Manual Port Mapping window appears. It lists the packet type, port number, IP address and protocol of each required port. 

3. To access the router configuration: 

a) Click the link containing the IP address of the gateway. The default browser starts, and prompts you for the routerís user name and password. 

 b) Enter the routerís user name and password. The browser shows a setup screen. c) Navigate to the screen used to set up port forwarding. See your router documentation. 

d) Set up port forwarding using the information from the Manual Port Mapping window. See your router documentation for instructions on how to map ports. For information on configuring routers and mapping ports, visit 

4. To check the status of each port through the firewall, click Check Firewall. The Firewall Test window appears. 

5. Select the services you want to check.

6. Click Test Ports. The system will check the ports for the selected services. 

Configuring the router manually 
If you cannot access the router configuration through the IP Configuration page, configure the router manually. 

1. Open the router configuration and navigate to the screen used to set up port forwarding. See your router documentation. 

2. Map port 5060 (Type: UDP) to the TalkSwitch unit acting as local proxy. Port 5060 is the default port for forwarding SIP signaling data to the TalkSwitch system (typically unit 1).

If required, you can map a different port. In this case, connect to the unit using TalkSwitch software, select Troubleshooting --> VoIP Settings and enter the port in the SIP signalling port field. 

3. Map the following ports (Type: UDP) to the TalkSwitch units. These RTP ports forward voice traffic to the TalkSwitch system by default. If required, you can map different ports. In this case enter the first port in the Starting RTP port box of the VoIP Settings window. 
VoIP Lines 
Per Unit Unit 1 Unit 2 Unit 3 Unit 4 
4     6000-6006      6010-6016       6020-6026     6030-6036
8      6100-6114      6200-6214       6300-6314      6400-6414 

4. If you are setting up external IP extensions, map port 69 (Type: UDP) to the TalkSwitch unit acting as local proxy. Port 69 allows the TalkSwitch system to configure external IP extensions.

5. If you are setting up TalkSwitch IP phones as external IP extensions, map port 8484 (Type: TCP) to the TalkSwitch unit acting as local proxy. Port 8484 allows the TalkSwitch system to configure TalkSwitch IP phones as external IP extensions.

6. Map ports 9393, 8485 and 8486 (Type: TCP) to the TalkSwitch unit acting as local proxy. Port 9393 allows remote configuration of the TalkSwitch system. 

7. If available, enable Quality of Service (QoS) to give voice traffic priority over data. 8. Save the configuration to the router.

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