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Form of phone numbers at incoming calls

To set up the routing in your phone system correctly, make sure you know the form of your phone number in the SIP-Invite. There are two different options:

  1. If the base phone number of your SIP trunk or the single phone number is chosen directly, your phone number has got the international form (0049xxx) in the Invite. Normally, base phone numbers of blocks of phone numbers (trunks) are not available.
  2. If an extension of your SIP trunk is chosen, the complete phone number has got the E.164 form (49xxx) in the Invite.