Troubleshooting Voip

Troubleshooting VoIP
4 3 2
Register with Call Server TFTP Get Config
Call Server

DHCP Request

10.9.14.4

Remote Branch

10.9.28.1

1

Power

Central Site

Connectivity andRegistration
Symptom No power No IP address Potential Problems and Troubleshooting Steps Not plugged in; PoE power supply over capacity; failed second power supply. Check power supplies and their capacityutilization. Proactively monitor power supplies and attached UPS batteries. Voice VLAN misconfigured; DHCP server failure; no route to/from DHCP server; no helper address from local router to DHCPserver; all DHCP addresses are assigned because the pool is full; static config on phone; ACL or firewall in the path. Check switch and router configurations with a configuration policy analysis system.Use ping and traceroute to test path and ACL problems. TFTP server failure; no route to or from the TFTP server; ACL or firewall in the path; TFTP failure in long delay and lossy path. Diagnose withping and traceroute. Check ACL and firewall configurations. Bad MAC address in call server, found in server log files; no route to or from call server; ACL or firewall in the path. Use a bar-codescanner to input phone MAC addresses to avoid typos. Use ping and traceroute to troubleshoot path problems and use configuration validation for firewall/ACL troubleshooting.

No config file or wrongconfig file Registration with call server fails

1
Phone 1

Offhook

7

Call RTP

Analog Phone

Ringtone

5 6
Call 2 RTP
Phone 3

2

Get Digits

Phone 2

Ringtone Ringtone

35 4 Call Setup

6 4

Offhook

1
Call Setup

Offhook

Call Server

Ringtone

3

2

Get Digits
Call 1 (Placed from Phone 1 to Phone 2) Call 2 (Placed from Phone 3 to PSTN AnalogPhone)

Call Operation
Symptom Call routing failure Call setup failure No-way audio Potential Problems and Troubleshooting Steps Overlapping dial spaces; incorrect dial search spaces. Use 10-digit...