Inviting a SIP/H.323 room system to a meeting

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The H.323/SIP Room Connector add-on allows you to dial out to an H.323 or SIP room system from the Zoom Client using the public IP address or SIP URI assigned to the device.

This article covers:

Prerequisites for inviting a SIP/H.323 room system to a meeting

  • Host account is Pro or above
  • At least one Room Connector port subscription (a device connected via call-out will count as one port)
  • Device must have an external, public IP address or SIP URI
  • External calls to the device must be allowed on your network firewall
  • Zoom version 3.5 or higher is required to use the call-out feature. 

How to invite a H.323/SIP room system to a meeting

  1. Sign in to the Zoom Desktop Client.
  2. Start or join a meeting.
  3. Click Participants in the meeting controls.
  4. Click Invite at the bottom of the participants panel.
  5. Click the Room System tab.
  6. Click the Call Out tab.
  7. Enter the IP address or SIP URI of the H.323 or SIP device, or select a device from the H.323/SIP Rooms Directory.
  8. Select the type of call you would wish to make - H.323 or SIP.
  9. Press Call.
  10. Click Show Keypad if you need to enter digits (e.g. meeting ID) during the call-out.
  11. Enter numbers using the pop-up keypad.

  1. Sign in to the Zoom Mobile Client.
  2. Start or join a meeting.
  3. Tap Participants in the meeting controls.
  4. Tap Invite at the bottom of the participants panel.
  5. Tap Invite H.323/SIP Room System tab.
  6. Tap the Call Out tab.
  7. Select the type of call you would wish to make - H.323 or SIP.
  8. Enter the IP address or SIP URI of the H.323 or SIP device, or tap the icon, to select a device from the H.323/SIP Rooms Directory.
  9. Tap Call.
  10. Click Show Keypad if you need to enter digits (e.g. meeting ID) during the call-out.
  11. Enter numbers using the pop-up keypad.

How to set the call speed for call-out to H.323 devices

The default call-out speed is 1920kbps (maximum). To set the call speed when using the Zoom call-out feature, you can enter the speed into the dial string as seen in the below examples.

[IP address];speed=768k

[IP address];speed=768000

[IP address]##[E.164 address];speed=1472k

How to send DTMF tones in a call-out to H.323 devices

To send DTMF tones when connecting to a Gatekeeper, MCU, or other H.323/SIP hardware that requires a party number, conference number, or e.164 address, you can enter these in the Call-out dial string.

[IP address];dtmf=[DTMF tones]

  • DTMF tones have a 1 second interval
  • Entering a "," will pause 1 second in between DTMF tones

For example:

Device IP address: 162.255.36.11
Conference Number: 15562
Password: 622

Dial: 162.255.36.11;dtmf=15562#,,622#

  • Dials IP address 162.255.36.11
  • Send DTMF tones '1' '5' '5' '6' '2' '#' pause pause '6' '2' '2' '#'

To add a call speed along with DTMF tones (using the example above):

Desired Call-Speed: 768 kbps

Dial: 162.255.36.11;dtmf=15562#,,622#;speed=768k

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