Configuring the device

The following steps are required to configure the device:

Set up the line to the SIP provider
Enable the ISDN interface, and assign MSNs to the internal numbers

Note: In this example, it is not necessary to configure SIP users: The SIP users are authenticated at the LANCOM with the settings created in the terminal equipment (softphone and VoIP telephone).

Configuring the device in detail:

Under LANconfig, start the setup wizard for configuring the Voice Call Manager. Enable the options SIP provider and ISDN phone system.
Enter a unique domain for the local VoIP domain which describes the local VoIP area for the site (e.g. mycompany.internal.)
Configure the line to the SIP provider, for example with the name SIPPROVIDER with the following values:
- Internal default number: All calls arriving from the SIP provider are forwarded to this internal number. Enter an internal number from your dialing plan here, e.g. 11.
- SIP domain/realm: You received this domain from your SIP provider; it is usually entered in the format sipdomain.tld without the part that designates any specific server.
- Registrar (FQDN / IP) (optional):
- Outbound proxy (optional):
- SIP-ID / user: Enter the SIP number with local area code here, providing that the SIP provider does not require any other information.
- Display name (optional): The display name is only required if the SIP provider verifies this during registration. If you enter a display name here, then this name will be displayed at the remote site. If the field remains empty, then the display name for the corresponding internal user is transmitted.
- Authentication name (optional): Special authentication names are not supported by all SIP providers. In many cases, the authentication name is the same as the SIP ID or the user name. Complete this field only if your SIP provider has issued you a special authentication name.
- Password: Enter the password for SIP access here.
Note: This description applies to a "user-defined configuration". If you select a special SIP provider from the list, then some of the parameters will be preconfigured automatically.
Configure an ISDN line for VoIP telephony use. For every MSN on your ISDN connection, make an assignment to an internal number within your telephone number plan during ISDN mapping.
- MSN 1 555 555 1 / internal phone number 11
- MSN 2 555 555 2 / internal phone number 12
Enter the local and national area code for the device's location. Using this information, the Voice Call Manager can decide whether or not outgoing calls are local calls, national or international long distance calls.
Based upon the entries made so far, LANconfig creates a suggestion for the call routing table which you can adapt to fit your requirements as follows:

Note: The # sign is a placeholder for any character string. The entry 0# is therefore suitable for all numbers dialed that have at least one 0 preceding them.

This suggested call routing table would place all external calls over the ISDN line. The SIP line is set up as a backup for international and national long distance calls and local calls that are not in the list of special or emergency numbers.

In order to channel calls to special destinations, such as international and national long distance calls, over the SIP provider, double-click on the corresponding entry in the table and switch the line used from ISDN to SIPPROVIDER. Don't forget to switch the backup line from SIP to ISDN, if necessary! After being adapted for international and national long distance, the call routing table should appear as follows: