The following table provides a summary of the information required for configuration and where it can be entered. Basically, all that is needed is a SIP PBX line for each location that is correspondingly setup at the remote location
| LANCOM, branch | SIP phone, branch | SIP PBX, headquarters | |
|---|---|---|---|
| Internal VoIP domain | mycompany.BRANCH01 | mycompany.HQ | mycompany.HQ |
| Internal SIP subscriber numbers at the branch office | |||
| External ISDN telephone numbers (MSNs) | |||
| Country and local area code | |||
| SIP PBX line | HQ | ||
| SIP PBX domain | mycompany.HQ | ||
| SIP PBX registration password | |||
| Call route |
|
Configuring the LANCOM in detail:
- Under LANconfig, start the setup wizard for configuring the Voice Call Manager. Enable the options SIP provider and ISDN phone system.
- Configure the device as described in the preceding examples:
- ISDN line with MSN mapping
- Area and country code for each location
- Enter a unique domain for the local VoIP domain which describes the local VoIP area for the branch office, e.g. mycompany.BRANCH01 for the first branch.
- Configure the line to the SIP PBX with the following values:
- SIP PBX line name: A unique name for the line to the SIP PBX, for example HQ for "Headquarters".
- PBX SIP domain/realm: Internal VoIP domain of the SIP PBX, e.g. mycompany.HQ.
- Registrar (FQDN or IP) (optional): SIP PBX address in the headquarters network, in the event that the device cannot be identified via DNS resolution of the VoIP domain (PBX SIP domain/realm).Note: Use the IP address of the SIP PBX from the private IP address range at the headquarters as accessed via VPN.
- Outbound proxy (optional): It is generally not necessary to designate the outbound proxy. You only need to enter a server designation here if the SIP PBX requires the corresponding addresses.
- Shared PBX password: This password is used by all SIP users when registering at the SIP PBX. If registration with a shared password is not desired, then an individual password can be used for each SIP user. In this case, each of the SIP users are configured with their own password in the LANCOM.
- Public PBX number: Here, enter the phone number where the SIP PBX can be reached from the public telephone network, e.g. from where the LANCOM is located. The number is entered with the necessary prefixes, but without an extension number. For example, if the SIP PBX is located in London and the LANCOM is in Birmingham, then the public PBX number is 020 12345.
- The call routing table suggested by the setup wizard automatically allows international and national long distance calls to be made via the SIP PBX at the headquarters.In addition, a default route is used to direct calls from the LANCOM VoIP users to internal SIP PBX numbers via the corresponding SIP PBX line.
Note: This special entry is only used during the second pass in the call routing table, after the first pass found no corresponding entry for "normal" routes and if no matching internal number was found in the list of local users.
