SIP Trunking

Enables T1 and Primary Rate ISDN connections to be replaced with IP-based SIP Trunk connections.

  • Status
  • Deployed
  • End-users the application is for
  • Enterprise

IP telephony service providers (ITSP) use SIP Trunking to deliver telephony and unified communication services to customers that use a SIP-based private branch exchanges (IP-PBX) and/or Unified Communications packages.  SIP Trunking refers to the use of IP broadband connectivity in place of traditional fixed line connectivity trunking options such as T1 circuits and primary rate ISDN (PRI) for interconnectivity with the public switched telephony network (PSTN).  In contrast to the traditional trunking options that provide a fixed number of voice channels, SIP trunks provide channel capacity that scales up and down as required.

SIP Trunking means that one office or campus that utilises IP telephony within that site may inter-connect with other such offices/sites directly using SIP instead of via the PSTN.  This means multi-media communications, such as video calls and white-board sessions for example, can be made across sites and across different companies.  Calls into and out of the IP network from traditional TDM or cell phones are also handled by the ITSP and delivered over the SIP Trunks.

A leading global telecom provider uses a purpose-built SIP Trunking service, hosted on OpenCloud Rhino, as the SIP session control platform within their core IP network for all their national and international SIP Trunking.  The service is targeted at medium to large businesses that need tens to hundreds of channels in a trunk, often across multiple sites.  The system supports IP Clear access, Global VPN only access, and support for a variety of Customer Premises Equipment (CPE).

The Rhino SIP Trunking Service provides the following capabilities:

  • Inbound and outbound calls      
  • DDI
  • CLIP/CLIR – outbound   
  • CLIP/CLIR – inbound
  • Number Presentation   
  • Anonymous Call Reject
  • Number Import / Export              
  • Incoming Call Barring
  • Outbound Call Barring   
  • Incoming Call Diversion
  • Call Admission Control  
  • Geographic & non-geographic number support
  • Multiple Codec Support               
  • Fax (G.711 or T.38)
  • Emergency calling (origin based routing)              
  • Private dial plan
  • UDP or TCP transport    
  • DNIS