WebEx is deployed using WebEx Audio. Main video, content, and audio to and from the WebEx cloud is negotiated between the Cisco Expressway-E on the customer site and the WebEx Cloud. All media (main video, content, and audio) flows over IP negotiated using SIP. Blue and green balls symbolize WebEx-enabled endpoints (ball displayed on endpoint display) (OBTP).

Figure 1. Network Topology - SIP Video, Audio and Presentation

WebEx is deployed using WebEx Audio using PSTN. Only main video and content is negotiated through the Cisco Expressway-E on the customer site and WebEx cloud  (SIP/IP).

At the time of scheduling, Cisco TMS provides the MCU PSTN access information (Dial number, Conference ID, Attendee ID). The Cisco MCU calls out and sets up the audio-only call over PSTN to the WebEx cloud, passing the conference ID and attendee ID using DTMF.

This deployment can be set up either of the following ways:

• Using a PSTN gateway registered to Unified Communications Manager.

• Using a PSTN gateway registered to Cisco Expressway-C

Note	Customers using a Codian ISDN Gateway must register it to Cisco VCS Control and therefore must use Cisco VCS.

Figure 2. Network Topology - SIP Video and Presentation with PSTN Audio Using Unified Communications Manager

Figure 3. Network Topology - SIP Video and Presentation with PSTN Audio Using Cisco Expressway-C

WebEx is deployed using WebEx Audio. Main video, content, and audio to and from the WebEx cloud is negotiated between the Cisco VCS Expressway on the customer site and the WebEx Cloud.  All media (main video, content, and audio) flows over IP negotiated using SIP. Blue and green balls symbolize WebEx-enabled endpoints (ball displayed on endpoint display) (OBTP).

Figure 4. Network Topology - SIP Video, Audio and Presentation

WebEx is deployed using WebEx Audio using PSTN. Only main video and content is negotiated through the Cisco VCS Expressway on the customer site and WebEx cloud  (SIP/IP).

At the time of scheduling, Cisco TMS provides the MCU PSTN access information (Dial number, Conference ID, Attendee ID). The Cisco MCU calls out and sets up the audio-only call over PSTN to the WebEx cloud, passing the conference ID and attendee ID using DTMF.

This deployment can be set up either of the following ways:

• Using a PSTN gateway registered to Unified Communications Manager.

• Using a PSTN gateway registered to VCS .

  Figure 5. Network Topology - SIP Video and Presentation with PSTN Audio Using Unified Communications Manager
  
  
  

  

  
  
  Figure 6. Network Topology - SIP Video and Presentation with PSTN Audio Using Cisco VCS Control