Example 6 describes calls between a SIP station and a non-SIP Communication Manager or the PSTN. Communication Manager is administered as either feature server or evolution server.

Call between a SIP station and a non-SIP Communication Manager or The PSTN shows the signaling flow associated with a call between a SIP station and a non-SIP Communication Manager or the PSTN.

Session Manager resources associated with the call depicted in Figure : 1 include:

• 2 SIP sessions

  • SIP - Session Manager - Communication Manager

  • Communication Manager - Session Manager - Communication Manager

Communication Manager resources associated with the call depicted in Figure : 1 include:

• 3 SIP trunk channels

• 1 non-SIP trunk channel

• CPU for 3 SIP trunk call legs and for 1 non-SIP trunk call leg

  Note:

  Session Manager skips origination processing and application sequencing for emergency calling.