Справочник Пользователя для ZyXEL p-2302hw-p1

P-2302HW/HWL-P1 Series User’s Guide

Chapter 9 SIP

151

DTMF Mode

Control how the ZyXEL Device handles the tones that your telephone makes when 
you push its buttons. You should use the same mode your VoIP service provider 
uses.

RFC 2833 - send the DTMF tones in RTP packets

PCM - send the DTMF tones in the voice data stream. This method works best 
when you are using a codec that does not use compression (like G.711). Codecs 
that use compression (like G.729) can distort the tones.

SIP INFO - send the DTMF tones in SIP messages

Note: In order to use the VoiP trunking feature you must set DTMF 

Mode to SIP INFO.

STUN

Active

Select this if all of the following conditions are satisfied.

•

There is a NAT router between the ZyXEL Device and the SIP server.

•

The NAT router is not a SIP ALG.

•

Your VoIP service provider gave you an IP address or domain name for a 
STUN server.

Otherwise, clear this field.

Server Address

Enter the IP address or domain name of the STUN server provided by your VoIP 
service provider.

Server Port

Enter the STUN server’s listening port, if your VoIP service provider gave you one. 
Otherwise, keep the default value.

Use NAT

Active

Select this if you want the ZyXEL Device to send SIP traffic to a specific NAT 
router. You must also configure the NAT router to forward traffic with the specified 
port to the ZyXEL Device. This eliminates the need for STUN or a SIP ALG.

Server Address

Enter the public IP address or domain name of the NAT router.

Server Port

Enter the port number that your SIP sessions use with the public IP address of the 
NAT router.

Outbound Proxy

Active

Select this if your VoIP service provider has a SIP outbound server to handle voice 
calls. This allows the ZyXEL Device to work with any type of NAT router and 
eliminates the need for STUN or a SIP ALG. Turn off any SIP ALG on a NAT router 
in front of the ZyXEL Device to keep it from retranslating the IP address (since this 
is already handled by the outbound proxy server).

Server Address

Enter the IP address or domain name of the SIP outbound proxy server. 

Server Port

Enter the SIP outbound proxy server’s listening port, if your VoIP service provider 
gave you one. Otherwise, keep the default value.

NAT Keep Alive

Active

Select this to stop NAT routers between the ZyXEL Device and SIP server (a SIP 
proxy server or outbound proxy server) from dropping the SIP session. The ZyXEL 
Device does this by sending SIP notify messages to the SIP server based on the 
specified interval.

Keep Alive with 
SIP Proxy

Select this if the SIP server is a SIP proxy server.

Keep Alive with 
Outbound Proxy

Select this if the SIP server is an outbound proxy server. You must enable 
Outbound Proxy to use this.

Table 61   VoIP > SIP > SIP Settings > Advanced