An SCCP IP phone places a call to a SIP phone that is registered to the same Cisco Unified Communications Manager Express. During the active call, call waiting indicates a second call is incoming to the handset, but the user decides to ignore it. In this scenario, what is the combined total number of signaling conversations and media flows that used the SCCP phone as an endpoint?

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B. 3 The SCCP phone is an endpoint in exactly 3 sessions: (1) the SCCP signaling conversation with CUCME for the active call, (2) the RTP media flow for the active call between the SCCP phone and the SIP phone, and (3) a second SCCP signaling conversation triggered by the call-waiting notification from CUCME. The ignored second call never establishes a media flow, and the SIP signaling leg between CUCME and the SIP phone does not involve the SCCP phone as an endpoint.

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A. 2 A count of 2 undercounts by omitting either the RTP media flow or the call-waiting SCCP signaling session that CUCME establishes with the SCCP phone.

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C. 4 A count of 4 incorrectly treats the SIP signaling leg between CUCME and the SIP phone as a session that uses the SCCP phone as an endpoint.

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D. 5 A count of 5 overcounts by attributing multiple media streams or both sides of each signaling leg to the SCCP phone as an endpoint.

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E. 6 A count of 6 incorrectly includes every signaling and media leg in the full call path as if the SCCP phone were an endpoint in each one.

An SCCP IP phone places a call to a SIP phone that is registered to the same Cisco Unified Communications Manager Express. During the active call, call waiting indicates a second call is incoming to…

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