By using the SIP PBX domain with VoIP terminal equipment, the user is registered in two ways:
- Since registration takes place with a valid domain defined in the LANCOM, terminal devices are registered as "local users".
- Since the domain that is used does not correspond to the LANCOM's own VoIP domain, a simultaneous attempt is made at registering with the upstream SIP PBX. If the password used corresponds to the password stored in the SIP PBX for this user, then the registration on the SIP PBX will be successful.
Configuring the SIP PBX
In the SIP PBX, all users from the branch office network are entered with their own internal number. For this purpose, either the shared password is entered or a separate password is assigned for each user.