ZyXEL Communications FMG3024-D10A User Manual

 Chapter 18 VoIP

FMG3024-D10A / FMG3025-D10A Series User’s Guide

SIP Local Port

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

Main SIP Server 
Address

Enter the IP address or domain name of the SIP server provided by your VoIP 
service provider. You can use up to 95 printable ASCII characters. It does not 
matter whether the SIP server is a proxy, redirect or register server.

SIP Server Port

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

REGISTER Server 
Address

Enter the IP address or domain name of the SIP register server, if your VoIP 
service provider gave you one. Otherwise, enter the same address you entered 
in the SIP Server Address field. You can use up to 95 printable ASCII 
characters.

REGISTER Server 
Port

Enter the SIP register server’s listening port number, if your VoIP service 
provider gave you one. Otherwise, enter the same port number you entered in 
the SIP Server Port field.

SIP Service 
Domain

Enter the SIP service domain name. In the full SIP URI, this is the part after the 
@ symbol.  You can use up to 127 printable ASCII Extended set characters.

Bound Interface Name

Bound Interface 
Name

If you select AnyWAN, the Device automatically activates the VoIP service when 
any WAN connection is up.

If you select MultiWAN, you also need to select the pre-configured WAN 
connections. The VoIP service is activated only when one of the selected WAN 
connections is up.

RFC Support

PRACK (RFC 
3262)

RFC 3262 defines a mechanism to provide reliable transmission of SIP 
provisional response messages, which convey information on the processing 
progress of the request. This uses the option tag 100rel and the Provisional 
Response ACKnowledgement (PRACK) method.

Select Supported or Required to have the Device include a SIP Require/
Supported header field with the option tag 100rel in all INVITE   requests. When 
the Device receives a SIP response message indicating that the phone it called is 
ringing, the Device sends a PRACK message to have both sides confirm the 
message is received. 

If you select Supported, the peer device supports the option tag 100rel to send 
provisional responses reliably.

If you select Required, the peer device requires the option tag 100rel to send 
provisional responses reliably.

Select Disabled to turn off this function. 

Session Timer 
(RFC 4028)

Select this to have the Device support RFC 4028.

This makes sure that SIP sessions do not hang and the SIP line can always be 
available for use.

VoIP IOP Flags - Select VoIP inter-operability settings.

Replace dial digit '#' to '%23' in SIP messages.

Remove ':5060' and 'transport=udp' from request-uri in SIP messages.

Remove the 'Route' header in SIP messages.

Don't send re-Invite to the remote party when there are multiple codecs 
answered in the Session Description Protocol (SDP).

Remove the 'Authorization' header in SIP ACK messages.

RTP Port Range

VoIP > SIP > SIP Service Provider (continued)