By Paul Giralt, Addis Hallmark, Anne Smith
Reveals the method you must get to the bottom of advanced difficulties in an IP telephony network
- Master troubleshooting recommendations and methodologies for all elements of a Cisco IP Telephony solution-Cisco CallManager, IP telephones, gateways, functions, and more
- Learn find out how to examine and unravel voice caliber difficulties, together with not on time audio, uneven or garbled audio, static and noise, one-way or no-way audio, and echo
- Read in regards to the number of trouble-shooting instruments at your disposal and the way and whilst to exploit them in keeping with the matter type
- Discover the aptitude explanations of universal difficulties and the way to successfully troubleshoot them to resolution
- Learn find out how to establish and get to the bottom of gateway difficulties through breaking the elements into logical teams and following a methodical troubleshooting approach
- Use most sensible practices thoughts to construct a more robust IP telephony deployment and keep away from universal mistakes
IP telephony represents the way forward for telecommunications: a converged information and voice infrastructure boasting larger flexibility and less expensive scalability than conventional telephony. the facility to troubleshoot an IP telephony atmosphere and the underlying community infrastructure is very important, simply because it is in any complicated system.
Troubleshooting Cisco IP Telephony teaches the troubleshooting talents essential to determine and unravel difficulties in an IP telephony answer. This booklet presents entire assurance of all elements of a Cisco IP Telephony (CIPT) resolution, together with CallManager, IP telephones, gateways, analog units, database and listing replication, name routing, voice mail, functions, community infrastructure, and extra. you are going to tips on how to learn hint documents, be sure while to show on tracing and Cisco IOS(r) software program voice debugging, and the way to troubleshoot voice caliber issues.
Troubleshooting Cisco IP Telephony exhibits you the way to collapse difficulties to discover the basis reason. Descriptions of every a part of the CIPT answer assist you comprehend the performance of every a part of the answer and the way each one half interacts with different elements of the answer. you will then research what steps to take and instruments to take advantage of to spot and get to the bottom of the reason for the problem.
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Additional resources for Troubleshooting Cisco IOS and PIX Firewall-Based IPSec Implementations
Sample text
Printed in USA. 2(14)S Crypto ipsec df-bit clear Crypto ipsec fragmentation before-encryption SEC-3010 8121_05_2003_c2 © 2003, Cisco Systems, Inc. All rights reserved. 89 MTU Issues Work around: Adjusting TCP MSS • Adjust TCP MSS (maximum send segment) under ingress interface: ip tcp adjust-mss
3 for PIX • IPSec pass-thru feature is supported on certain NAT/PAT devices; ISAKMP cookie and ESP SPI are used to build translation table • NAT -T is turned on by default on Cisco IOS • Use isakmp nat-traversal
All rights reserved. Printed in USA. 2) frag. 20) frag. 11 Adjust path MTU on corresponding IPSec SA 1454 DF=1 path mtu 1400, media mtu 1500 current outbound spi: EB84DC85 ICMP Type3 Code 4 (1354) 1354 DF=1 SEC-3010 8121_05_2003_c2 1400 1400 1354 © 2003, Cisco Systems, Inc. All rights reserved. 85 Common Problem • PMTU ICMP packets lost or blocked Debug ip icmp on router to verify if ICMP packets are sent or received Use sniffer to verify if ICMP packets are lost • Work arounds Reduce MTU or disable PMTU on end host Configure router to clear DF bit of data packets Adjust TCP MSS on router to fine tune TCP windows Look-ahead fragmentation SEC-3010 8121_05_2003_c2 © 2003, Cisco Systems, Inc.