2.5.14 Accept a Voice Call

This use case, illustrated in the following diagram, describes how a protocol client accepts and answers a voice call. The user, which receives the call, has two or more protocol clients that are signed in (Multiple Points Of Presence).

Figure 13: Steps for accepting a voice call

References

• [MS-AVEDGEA]

• [MS-ICE]

• [MS-ICE2]

• [MS-ICE2BWM]

• [MS-OCPSTN]

• [MS-RTP]

• [MS-RTPRADEX]

• [MS-SDPEXT]

• [MS-SIPRE]

• [MS-SRTP]

• [MS-SSRTP]

• [MS-TURN]

• [MS-TURNBWM]

Preconditions

• The protocol clients are signed in, as described in section 2.5.5.

Steps

• The steps to allocate media ports on the edge protocol server for firewall and NAT traversal are omitted for clarity. These steps are described in see [MS-AVEDGEA], [MS-TURN], and [MS-TURNBWM].

Post-conditions

• A session is established between Client A and Client B, and real-time voice packets are exchanged between Client A and Client B.