VoIP Trunking On-Net Call

This call type occurs between endpoints connected to Cisco Unified Communications Manager and a Legacy PBX that is connected to a Voice Gateway. The call type includes:

• SIP/SCCP signaling traffic between the endpoint and the Cisco Unified Communications Manager
• SIP signaling traffic between the Voice Gateway and the Cisco Unified Communications Manager
• TDM signaling traffic between the Legacy PBX and Voice Gateway
• Media traffic between the endpoint and Voice Gateway

On-Net Call (VoIP Trunking)

Usage	Called number must follow the enterprise internal numbering plan requirement Called number must be defined by ranges and not individual numbers Called number can be either DN or ISP +DN depending on the enterprise internal numbering plan adopted. DN can be either just Extension for flat Dial Plan or SLC + Extension or ISP + SLC + Extension. Voice codec used must be selected per site Only voice calls can be made; video calls are not supported Fax is supported as best effort only MoH is provided in accordance with the site’s MoH policy Voice Gateway configuration is part of the solution Voice Gateway redundant deployment is not supported Enbloc signaling is between the Voice Gateway and Cisco Unified Communication Manager Any target number can be used unless restricted by Class of Service Codec is dynamically selected based on the endpoints used Alternate call routing when the Legacy PBX or Voice Gateway is unreachable is not supported
Accessibility	User can perform On-Net call from any endpoint registered with Cisco Unified Communications Manager Legacy PBX connected using a Voice Gateway is considered to be similar to an Inter-Site call User uses the same dialing behavior as Inter-Site On-Net Call
Usage Example	Enables the integration with the existing environment during the transition period of all users
Default Configuration	Available to all users at all sites of the enterprise Codec: Voice - G.729 and G.711 Codec: Sample Size - 20ms/20Bytes and 20ms/160Bytes Bandwidth: 8kbps and 64kbps

Configuration Choices	Feature availability cannot be changed by site or user Codec can be selected between G.711 and G.722 on a per-site basis
Redundancy	Available to users without restrictions
Survivability	Not available to users in fallback mode
Endpoint Types Supported	Cisco IP phones Cisco ATA Cisco VG
Example	Example: Phone D (DN=8 200 6100) Dial 8 400 1234 to Legacy PBX Connected Number shows 8 400 1234 Legacy PBX (Site 3) Dial 8 100 2123 to Call A Phone C (DN=8 100 2123)