Tutorials: SIP Trunk Setup UCM 61XX

Required Access: Grandstream

Last Updated: 5/28/2025

Log in to the Grandstream PBX

Under the "Extension/Trunk" tab, click on "VoIP Trunks" from the drop down.

Click on the "+ Add SIP Trunk" button.

Enter the following:

• Type: Register SIP Trunk
• Provider Name: Voxtelesys
• Host Name: From Voxtelesys
• Username: From Voxtelesys
• Password: From Voxtelesys

Enter the following:

• From Domain: Same as the Host Name

Go to the advanced tab and select the codecs:

1. PCMU
2. PCMA
3. G.729

• Send PPI Header: Enabled
• PPI Mode: DOD Number

To update your caller ID, select "DOD" under "Options"

• DOD Number: Number from Voxtelesys
• DOD Name: Pick a name identifier
• Add Extension: Add extensions that will use this number as their caller ID.

Save and apply the configuration.