Prestige 2002 Series User’s Guide

11.8 Problems with Voice Service

Table 34 Troubleshooting Voice Service

PROBLEM

CORRECTIVE ACTION

 

 

After the VoIP is

This could be caused by a short NAT UDP session timeout on the NAT router.

configured and

When the SIP session’s entry in the NAT table times out, the NAT router does not

working, others are

have any record to use for forwarding VoIP traffic to the Prestige.

unable to call you

If possible, set the NAT router to use a longer NAT UDP session timeout.

or you lose your

Otherwise, try one of the following:

connection during a

call. There is a NAT

• Shorten the registration expiration period (see the Expiration Duration field

router between the

in the VoIP Advanced screen) in order to cause the Prestige to re-register

Prestige and the

with the SIP register server more frequently. Note that this will not help if the

SIP server.

SIP register server enforces a long registration expiration period (since the

 

Prestige will also use the period set by the SIP register server).

 

• Use STUN. If your VoIP service provider does not have a STUN server, you

 

can still enable STUN and enter the IP address and port number of the SIP

 

server in the STUN server fields. This causes the Prestige to send STUN

 

requests to the SIP server. While this will not make STUN work (since there

 

won’t be any responses to the STUN requests), it should keep the NAT UDP

 

session in the NAT router.

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Chapter 11 Troubleshooting