Cisco TelePresence MCU 4200 Series

Setting up a SIP trunk between an MCU and an IP PBX

Hierarchical Navigation

How do I set up a SIP trunk between a Cisco TelePresence MCU and an IP PBX?

On the IP PBX:

  1. Assign one or more accounts to be used by the MCU: at least two accounts if you want to be able to both dial in to the auto attendant and to a conference directly (one for the MCU and one for the conference ID).
  2. Create a SIP trunk on the IP PBX that will route calls to these accounts on the MCU's IP address. (See the IP PBX menu for detailed instructions.)

On the MCU:

  1. Go to Settings > SIP.
  2. Set SIP registrar usage, to Disabled.
  3. Leave the SIP registrar domain blank.
  4. For SIP registrar type, select Standard SIP
  5. For Username, enter one of the SIP accounts that was created on the IP PBX. This is used as the calling user when MCU initiates the call. It also allows the user to call in to the MCU’s auto attendant.
  6. If IP PBX requires authentication enter the Password for the SIP account entered in the Username field. (Leave the field blank if the IP PBX treats the MCU as a trusted peer without authentication.)

    Note that if authentication is required on the IP PBX, then all accounts for the MCU should share the same password.

  7. Leave the SIP proxy address blank.
  8. For Outgoing transport, choose either TCP or UDP to match the SIP transport protocol setting on your IP PBX.
  9. Click Apply changes to save the configuration.
  10. Go to Settings > Conferences and select the audio and video codecs to be used for SIP calls. Click Apply changes to save the configuration.
  11. Go to Conferences, select your conference and click the Configuration tab.
  12. For Numeric ID enter a different account number from the one used for the MCU’s SIP configuration.
  13. Click Update conference.
  14. To make outgoing calls to the IP PBX, add a participant to the conference.
  15. For Address, enter the full SIP URI of the called party in the form “callee@PBX_IP_addr” or if the address is resolvable from the MCU’s DNS server “callee@PBX_FQDN”. For example, if the callee is 2201 and the IP PBX’s FQDN is “” at IP address, then you can enter either “2201@” or “”.
  16. For Call protocol, select SIP.
  17. Click Call endpoint.
  18. To call from SIP clients to the MCU conference, dial the conference ID that was assigned to the MCU. For example, if 2200 is assigned to a conference, then dial 2200 from the client and the call will be routed by the IP PBX to the MCU.

This article applies to the following products:

  • Cisco TelePresence MCU 4200 / MSE 8420
  • Cisco TelePresence MCU 4500
  • Cisco TelePresence MSE 8510 blade

May 2nd, 2011 TAA_KB_159