A call that is placed off site must go through a gateway. This gateway could be a Cisco Media Gateway Control Protocol (MGCP), H.323, or Session Initiation Protocol (SIP) gateway. This course discusses how to troubleshoot these different types of gateways and provides an understanding of the most common issues that are associated with placing a call off site. During call processing, Cisco IOS voice gateways analyze digits and can perform digit manipulation. Understanding these functions and how a Cisco IOS voice gateway performs these tasks differently from Cisco Unified Communications Manager can help troubleshoot common Cisco IOS voice gateway issues. Cisco Unified Communications Manager provides the dial plan for most devices in a Cisco Unified Communications system. This dial plan is often the most complex troubleshooting area of placing off-site calls in your Cisco Unified Communications system. This lesson reviews dial plans, including globalized call routing, and addresses the most common issues that can occur with these dial plans. Other common voice issues that this course covers include troubleshooting missing or incorrect caller ID, ringback issues, one-way audio, dead air, dropped calls, and public switched telephone network (PSTN) setup failure.Learning Objectives
- Describe how to troubleshoot MGCP, H.323, and SIP gateways
- recognize how the Cisco IOS voice gateway performs inbound and outbound dial-peer matching
- Recognize how incorrect discard digits instructions (DDIs) can cause calls to the Public Switched Telephone Network (PSTN) to fail
- Describe how to ensure that Cisco Unified Communications Manager is correctly set up with respect to route patterns, route groups, route lists, and CoS
- Describe how to ensure that the gateway is correctly set up with respect to route patterns, route groups, route lists, and CoS
- Recognize caller ID and no-ringback scenarios and the voice issues that can occur in a Cisco Unified Communications system
- Recognize one-way audio, dead air, dropped, and second dial tone issues that can occur in a Cisco Unified Communications system
- Recognize the common reasons why you might experience call setup issues
- Recognize the ways to resolve call setup issues
- Recognize the characteristics of globalized call-routing
- List the most common issues that can occur while using globalized call-routing
- Troubleshoot globalized call-routing issues
Anyone wishing to obtain the Cisco Certified Network Professional CCNP Voice designation that validates the skills and knowledge required in order to create a voice solution that is transparent, scalable, and manageable.
Established IT professionals with a working knowledge of converged voice and data networks, of MGCP, SIP, and H.323 as well as a working knowledge of their implementation on Cisco IOS gateways, and working knowledge of Cisco Unified Communications Manager, Cisco Unified Communications features and applications, and Cisco IOS voice gateways in single-site and multisite environments.
Candidates who have completed the Cisco Certified Network Associate Voice (CCNA Voice) Certification which is obtained by completing the Introducing Cisco Voice and Unified Communications Administration 640-461 (ICOMM) v8.0 exam.