User guide

VoIP SIP VoIP SIP Servers, Users & the Forwarding Data-

iMG/RG Software Reference Manual (Voice Service)

6-18

FIGURE 6-2 Phone --> iMG(A) --> SIP IP Phone

6.2.2 VoIP SIP Servers, Users & the Forwarding Database

The VoIP SIP subsystem on iMG residential gateways is based on the concept of SIP servers, local users, call for-

warding rules and access ports.

The following section describes SIP servers, local users and forwarding database.

• SIP servers are servers where local users register themselves (Location Servers) and where calls are routed

(Proxy Servers) when an outgoing call is going to be set up.

• Users are entities uniquely identified in the system by a name with an associated phone number. The User's

phone number represents the user's address on the local system.

• Forwarding rules are local call routing rules used to forward an incoming call from a local user to a remote

system or to a remote user. Forwarding rules are also used for locally originated calls when the called party

SIP IP Phone

SIP Server

Unit

Analog

(or Digital Phone)

VOIP IP

Network