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COMfortel 1400 IP/2600 IP/3600 IP - Firmware V2.6 - Operation/Configuration - V05 09/2016
Settings
Providers and PBXs
Evaluation of incoming SIP messages
Depending on the SIP provider, the phone number of the caller can be in
different locations in the SIP message. The following options and settings
must be selected and made to determine at which location of the SIP
message the phone number shall be searched.
Two different phone numbers can be transmitted: The actual phone number
of the caller (screened number/network provided number) and a number
self-selected by the caller (unscreened number/user provided number). If a
network provided number is extracted from the SIP message, functions
such as Call Through can be used.
Evaluation type
Standard
: Selects an evaluation method for phone numbers which will work
for most providers.
Standard (use From headers as screened number)
: Selects an
evaluation method for phone numbers which will work for most providers.
The user provided number (corresponds to CLIP no screening) of the
header “From“ will be taken over into the network provided number. The
phone numbers can, for example, be used for Call Through via VoIP.
Caution:
If you have selected this option, your telephone and your PBX
are vulnerable to attacks, for example by transmission of a phone
number manipulated by the attacker. Therefore, to protect your
telephone and PBX, assure yourself that the VoIP provider has integ-
rated sufficient security measures in the number presentation.
As described in RFC3325
: Selects a phone number evaluation method in
accordance with RFC 3325 (http://www.ietf.org/RFC/rfc3325.txt). This
method of evaluating phone numbers is used if the number presentation is
guaranteed by security mechanisms.