Cisco Webex Hybrid Services HCS Integration Reference Guide

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Book Title

Cisco Webex Hybrid Services HCS Integration Reference Guide

Chapter Title

Call Flows

Results

Updated:
July 9, 2019

Chapter: Call Flows

Call Flows

Call Flow Scenarios

The following call flow scenarios are described in this section:

  • Cisco Webex-to-Cisco HCS call.

  • Cisco HCS-to-Cisco Webex call.

  • Cisco Webex-to-PSTN call through Cisco HCS.

Cisco Webex-enabled users Alice and Bob each have a desk phone. Both of them can make and receive calls from their desk phone or from Cisco Webex.

Cisco Webex to Cisco HCS Call Flow

Table 1. Cisco Webex to Cisco HCS Call Flow

Scenario

Signaling Path

Media Path

  1. Using Cisco Webex, Alice calls Bob

  2. Bob’s Cisco Webex and desk phone ring

  3. Bob answers the call at his desk phone

  1. The Cisco Webex forks the call to Bob (Cisco Webex) and to Expressway

  2. The call is sent to Cisco Unified Communications Manager as though initiated by Alice's Cisco Webex remote destination

Cisco Webex > Cisco Webex > Expressway > Customer's private network > Bob's desk phone

Alice and Bob share the desktop in Cisco Webex.

Note 

In this example, the signaling and media for screen sharing are identical to Cisco Webex without Hybrid Services.

Figure 1. Cisco Webex to Cisco HCS Call Flow

Cisco HCS to Cisco Webex Call Flow

Table 2. Cisco HCS to Cisco Webex Call Flow

Scenario

Signaling Path

Media Path

  1. Using the desk phone, Alice calls Bob

  2. Bob’s Cisco Webex and desk phone ring

  3. Bob answers the call using Cisco Webex

  1. Alice (desk phone) initiates the call through Cisco Unified Communications Manager to Bob's directory number

  2. Cisco Unified Communications Manager forks the call to Bob's deskphone and the Cisco Webex remote destination

  3. The call to the Cisco Webex remote destination is forwarded through Expressway to the Cisco Webex Cloud and Bob's Cisco Webex client

Alice (desk phone) > Customer's private network > Expressway > Cisco Collaboration Cloud > Bob (Cisco Webex client)

Alice and Bob share the desktop in Cisco Webex.

Note 

In this example, the signaling and media for screen sharing are identical to Cisco Webex without Hybrid Services.

Figure 2. Cisco HCS to Cisco Webex Call Flow

Cisco Webex to PSTN through Cisco HCS Call

Table 3. Cisco Webex to PSTN Through Cisco HCS Call Flow

Scenario

Signaling Path

Media Path

  1. Alice (Cisco Webex user) calls a PSTN number

  2. PSTN phone answers call

  1. Alice (Webex) initiates call to Webex Cloud

  2. Webex Cloud routes the Alice initiated PSTN call to Cisco Unified Communications Manager though Expressway

  3. Expressway forwards to Cisco Unified Communications Manager based on Alice’s domain

  4. Cisco Unified Communications Manager routes the call to PSTN through the Cisco HCS SBC trunk

  5. PSTN phone answers the call

Alice (Cisco Webex) >Cisco Webex Cloud > Expressway > Cisco HCS SBC > PSTN

Figure 3. Cisco Webex to PSTN Through Cisco HCS Call Flow

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