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SIP Registration section

The entry fields for a SIP registration are:

Name Descriptive name for this registration.
Disable A switch to temporarily disable this interface without deleting the configuration.
Server Address (primary) The optional IP address of the SIP provider to where the SIP messages (REGISTER,INVITE,etc.) are to be sent. Only necessary if either the IP address cannot be obtained from the SIP URI's domain or a proxy server is to be used.
Server Address (secondary) Backup IP address used if the SIP server on the primary IP address does not answer anymore.
ID Here you enter the registration ID followed by the SIP provider domain name (for example
STUN Server The STUN server name or IP address must be configured if this device has no public IP address while the SIP server is accessible under a public IP address. The value is given by the SIP provider or administrator (for example, or You can choose any STUN server; it does not necessarily have to correspond to the one of the SIP provider.
Username Username for authorization (only if different from the registration ID).
Password / Retype The password for authorization must be specified here (Password) and confirmed (Retype).
From Header Interoperability option for outgoing calls. Controls the way the CGPN is transmitted to the SIP provider.

SIP Interop Tweaks

Proposed registration Interval Set in seconds, default it is 120 seconds
AOR The From header contains the fixed registration URI (AOR). The actual calling party number and name will be transmitted inside the P-Preferred-Identity header (RFC 3325).
AOR with CGPN as display The From header contains the fixed registration URI (AOR) with the calling party number as display string in front of the AOR.
CGPN in user part of URI The From header contains an URI with the calling party number as user part (left from @).