Operation Manual

COMfortel 1400IP/2600IP/3600IP - Firmware V2.2G - Operation and Configuration V03 07/2015 487

Settings

Providers and PBXs

Configuring the Evaluation of Incoming SIP Messages

The telephone numbers of incoming VoIP calls listed in the caller list usually need to be

converted before they can be used for callbacks. The following options are available here:

• Evaluation method: The following options are available:

• Internationalise unknown telephone numbers: If this function is enabled, telephone

numbers which are not transferred in the usual format: (e. g. +445306… or 00445306…)

are converted into this format.

You can configure an evaluation method as follows:

• Separately for the provider or PBX

• Using the configuration manager

• Using the telephone

Using the Configuration Manager to Evaluate Incoming SIP Messages

1. Check the format in which the telephone numbers issued by the provider are trans-

mitted and displayed in the caller list (Message key > Caller list).

2. Open the Settings > Providers & PBXs screen.

3. In the line that contains the provider/PBX, click Configure.

Standard: Selects an evaluation method for telephone numbers which will

work for most providers.

Standard (use From headers as screened number): Selects an evalu-

ation method for telephone numbers which will work for most providers. The

user provided number (unscreened number, corresponds to CLIP no

screening) of the header “From“ will be taken over into the network provided

number (screened number). The telephone 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 telephone number

manipulated by the attacker.

As described in RFC3325: Selects a telephone number evaluation method

in accordance with RFC 3325 (http://www.ietf.org/RFC/rfc3325.txt). This

method of evaluating telephone numbers is used if the number presentation

is guaranteed by security mechanisms.

User-defined: If the Default and As described in RFC3325 options are

unsuccessful, you can also define your own method of evaluating a

telephone number within certain limits.