Cisco call manager express
Cisco Networking Academy Program
IP Telephony
© 2005 Cisco Systems, Inc. All rights reserved.
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1
Overview of Cisco CME
IP Telephony
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2
What is Cisco CallManager Express?
Cisco CME
Trunks PSTN
WAN
• Call processing for small to medium sized deployments • VoIP integrated solution • Up to 120 IP phones • IOS based solution
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3
What is Cisco CallManager Express? (Cont.)
• Select IOS based platform • Multiservice access routers
2600XM
3700
1700
IP Telephony
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20
Real-Time Transport Protocol
• Provides end-to-end network functions and delivery services for delay-sensitive, real-time data, such as voice and video • Works with queuing to prioritize voice traffic over other traffic • Services include:
Payload type identification Sequence numbering Timestamping Delivery monitoring
IP Telephony
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21
Real-Time Transport Control Protocol
• Monitors the quality of the data distribution and provides control information • Provides feedback on current network conditions • Allows hosts involved in an RTP session to exchange information about monitoring and controlling the session • Provides a separate flow from RTP for UDP transport use
IP Telephony
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22
RTP Header Compression
• RTP header compression saves bandwidth by compressing packet headers across WAN links
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23
When to Use RTP Header Compression
• Narrowband links • Slow links (less than 2 Mbps) • Need to conserve bandwidth on a WAN interface
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24
Challenges and Solutions in VoIP
IP Telephony
© 2005 Cisco Systems, Inc.