Draytek Vigor2600VG Manual page 25

Sip related function
setup
Fig. 4 SIP Related Function Setup Page
SIP Port: The port number used to send/receive sip message for build a session.
The default value is 5060, you can change to other number but it needs other
party also change to the same number.
Registrar: you can enter domain name or IP address of SIP Registrar server.
For example, iptel.org or 195.37.77.101 are identical. You have to apply an account
of SIP Registrar server before you can use it.However, it is not necessary to use sip
registrar server function in order to use VoIP function.
Use Register: check this box then you can use register function to register your
2600V with an sip registrar server.
25