VoIP gateway - How to set 2N® NetStar as a VoIP gateway

  • This „how to“ manual will help you to set up 2N® NetStar as a SIP <-> GSM/UMTS gateway. Before you start programming the system, it is highly recommended to read configuration manual.

  1. Check your licence (Global data -> Licence). If you do not have it, please contact us.

2. Set up a VoIP card

3. Set up a SIP trunk.

    1. Create a SIP trunk – SIP GW. (Virtual ports -> SIP -> SIP Gateway).
      Add RTP interface
      Select codecs
      Set up IP address of the other peer and realm (in our example proxy1.test.com)
    2. Set up SIP GW as Default IN (important for proper network tones transmission).
    3. Delete all tones from Default IN (Properties -> Tones)
  2. Set up GSM/UMTS ports
    1. Create a budle - GSM (Routing -> Routing objects -> Bundle) and use all GSM ports in this bundle. It is recommended to use cyclical strategy.
  3. Create a router - From PBX. (Routing -> Routers -> Called party number Router)
    this router will send all calls to GSM. It is very important to specify the length of the numbers. In our example GSM prefixes are 6 and 7 and numbers are 9-digit long.
  4. Use router From PBX as a from port router on the SIP GW. (Properties -> Routing)
  5. Create router – From GSM. (Routing -> Routers -> Called party number Router)
    the purpose of this router is to route all calls from GSM to a predefined extension in the PBX (in our example 111).
  6. Use router From GSM as a from port router on Default OUT. (Properties -> Routing)
  7. Switch off CLIP normalizing (Global Data -> Localisation)
    in case you do not want NetStar to modify incoming CLI (e.g. strip international prefix)