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alive. Some gatekeepers require the devices to keep re-registering to it using
the full information, in this case, please set the “FullRRQ” to “Yes”.
Note: The VOIP 2747 can pass the NAT/router devices if the gatekeeper supports
this function. The IP Phone will automatically detect if the gatekeeper supports
this and do the proper configuration to work under this NAT environment.
3.2.2 Registration to a proxy server (SIP version)
When the VoIP vendor/operator is running the SIP system, use the VOIP
2747 to register to the proxy server. Configure the following parameters to do
the registration.
Configure ► Password：135 ► SIP
A. Number – please input the phone number (username) to register to the proxy
server.
B. Password – please input the password to register to the proxy server.
This password is carried in the SIP Proxy-Authorization field using
MD5 digest method for authentication purposes. Not every proxy server
needs this field; if not needed, keep it empty.
Cortelco’s VOIP 2747 follows the standard RFC-2617 to do the
authentication.
C. Login ID – please input the username for registration authorization.
When the IP Phone is registering to the proxy server, the Authorization
field will have the username=”xxxxx” field; if the “Login ID” entry is empty,
the username will use the “Number” input value, but when the “Login ID”
field has some value, the username will use this “Login ID” value for
authorization.
D. (Yes / No) Proxy On – please select Yes and register to the proxy server.
After this item is enabled, two more menu items will appear. One is the
proxy server address, to set the IP address or domain name address of the