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

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.

Requirements 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 an H.323/SIP room system to a meeting
How to specify the regional data center to call out from
How to set the call speed for call-out to H.323 devices
How to send DTMF tones in a call-out to H.323 devices

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

Note: When dialing or calling a SIP/H.323 room system during a meeting, make sure that the Zoom app has network connectivity to the Zoom CRC server over TLS using port 443.

Windows | macOS | Linux

Sign in to the Zoom Workplace app.
Start or join a meeting.
Click Participants in the meeting controls.
Click Invite at the bottom of the participants panel.
Click the Room System tab.
Click the Call Out tab.
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.
Select the type of call you would wish to make - H.323 or SIP.
Press Call.
Click Show Keypad if you need to enter digits (e.g. meeting ID) during the call-out.
Enter numbers using the pop-up keypad.

Android | iOS

Sign in to the Zoom Workplace app.
Start or join a meeting.
Tap Participants in the meeting controls.
Tap Invite at the bottom of the participants panel.
Tap Invite H.323/SIP Room System tab.
Tap the Call Out tab.
Select the type of call you would wish to make - H.323 or SIP.
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.
Tap Call.

How to specify the regional data center to call out from

By default when calling out to a SIP/H.323 room system, the US data center will be utilized. To specify the regional data center, and ensure the best call quality, the IP address or SIP domain for the desired regional data center can be appended to the dial string as seen in the below examples.

[Target device IP address];rc=x.x.x.x

[Target device IP address];rc=[SIP domain]

For example:

Device IP address: 144.195.19.161

SIP Domain: zmau.us

The dialing string would be 144.195.19.161;rc=zmau.us

Note: if an administrator has disabled particular data center regions for meetings or webinars, the disabled regional data centers cannot be used when calling out.

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.

[Target device IP address];speed=768k

[Target device IP address];speed=768000

[Target device 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.

[Target device 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: 144.195.19.161
Conference Number: 15562
Password: 622

Dial: 144.195.19.161;dtmf=15562#,,622#

Dials IP address 144.195.19.161
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: 144.195.19.161;dtmf=15562#,,622#;speed=768k