Dialing different number ranges

When dialing other parties, the following number ranges are available for use:

• Internal numbers are comparable to the extension numbers for traditional PBX systems. Subscribers can reach one another directly using these internal numbers without having to go through a public telephone network.The internal numbers must be unique for all subscribers within the private telephone network, this also includes any other PBX systems that may be connected! The internal subscribers can be reached by simply dialing the internal number without a "0" preceding it.
  Note: Depending on the settings for automatic outside line access, a special preceding dialing signal may be required.
• Via local telephone numbers you can reach external parties who are in the same local telephone network as the R&S®NC VoIP router, i.e. users with the same area code as the public line for the R&S®NC VoIP router.In decentralized locations that extend beyond city or state boundaries, the physical location of the device is decisive, even if a central PBX is located at a different location. Therefore, for a R&S®NC VoIP router in London, all telephone subscribers in the local telephone network for London can be reached using local numbers, even if a SIP PBX connected via VPN can be reached in Manchester.
  Note: Depending on the settings for automatic outside line access, a "0" prefix may be required.
• The national and international numbers behave in the same way as local numbers; here, the physical location of the devices is decisive for the assignment of corresponding access codes. Therefore, a R&S®NC VoIP router in Austria belongs to the national telephone network in Austria, even if there is a VPN connection to the SIP PBX at the headquarters in Germany.