Trunk Sharing Overview

Trunk sharing simplifies SIP trunk deployment across multiple P-Series Cloud PBX instances by allowing them to share a single centrally managed trunk set in Yeastar Central Management, which streamlines trunk management and prevents excessive SIP requests.

Requirements

  • The firmware of P-Series Cloud PBX is 84.21.0.16 or later.
  • You have access to the trunk sharing feature.
    Tip: Confirm this permission by checking the visibility of the menu Cloud PBX > Trunk Sharing. If the menu is absent, please request access from your service provider.

How trunk sharing works

With trunk sharing, Yeastar Central Management centrally registers a single SIP trunk with the ITSP, eliminating the need for each PBX instance to register individually. Multiple PBX instances share this centrally managed trunk for both inbound and outbound calls, with each PBX identified by a unique set of DID numbers. Outbound calls are sent to Yeastar Central Management and routed through the shared trunk, while inbound calls are directed to the appropriate PBX based on the DID number.

Setup workflow

Follow the steps below to configure trunk sharing for P-Series Cloud PBXs on Yeastar Central Management:

1. Create a shared trunk

Create a SIP trunk and configure the trunk settings according to your specific requirements. For more information, see SIP Trunk Overview.

Note:

To verify the caller ID authenticity and prevent caller ID spoofing, you can enable STIR/SHAKEN feature for shared trunks.

For more information, see STIR/SHAKEN Overview.

2. Add DID numbers to the trunk

Add the DID numbers provided by your ITSP to the shared trunk. For more information, see Add DID Numbers to a Trunk.

3. Assign DID numbers to a P-Series Cloud PBX

Assign the DID numbers to the corresponding Cloud PBX instances to bind them to the shared trunk and ensure correct inbound call routing.