Cisco Systems OL-9420-01 appendix Cisco Unified IP Phone Initialization Process, Procedure

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Appendix B Case Study: Troubleshooting Cisco Unified IP Phone Calls

Troubleshooting Intracluster Cisco Unified IP Phone Calls

Figure B-1 Sample Topology of Intracluster Cisco IP Phone-to-Cisco IP Phone Calls

IOS Gatekeeper

IP

IP

 

IP

IP

 

 

172.16.70.241

 

 

Unified

Unified

172.16.70.255

Unified

Unified

CM3

CM4

 

CM1

CM2

 

 

IP WAN

 

 

172.16.70.245

172.16.70.243

 

172.16.70.228

172.16.70.229

 

 

PSTN

 

 

Cluster 1

 

 

Cluster 2

 

Zone 1

 

 

 

Zone 2

=T1/PRI

=T1/CAS

=RAS

141754

Cisco Unified IP Phone Initialization Process

The following procedure explains in detail the Cisco Unified IP Phone initialization (or boot up) process.

Procedure

Step 1 If you have set the appropriate options in DHCP server (such as Option 066 or Option 150), the Cisco Unified IP Phone sends a request, at initialization to the DHCP server to get an IP address, Domain Name System (DNS) server address, and TFTP server name or address. It also gets a default gateway address if you have set these options in the DHCP server (Option 003).

Step 2 If a DNS name of the TFTP sever is sent by DHCP, you need a DNS server IP address to map the name to an IP address. Bypass this step if the DHCP server sends the IP address of the TFTP server. In this case study, the DHCP server sent the IP address of TFTP because DNS was not configured.

Step 3 If a TFTP server name is not included in the DHCP reply, the Cisco IP Phone uses the default server name.

Step 4 The configuration file (.cnf) file gets retrieved from the TFTP server. All .cnf files have the name SEP<mac_address>.cnf. If this is the first time the phone is registering with the

Cisco Unified CallManager, a default file, SEPdefault.cnf, gets downloaded to the

Cisco Unified IP Phone. In this case study, the first Cisco Unified IP Phone uses the IP address 172.16.70.230 (its MAC address is SEP0010EB001720), and the second Cisco Unified IP Phone uses the IP address 172.16.70.231 (its MAC address is SEP003094C26105).

Step 5 All .cnf files include the IP address(es) for the primary and secondary Cisco Unified CallManager(s). The Cisco Unified IP Phone uses this IP address to contact the primary Cisco Unified CallManager and to register.

Troubleshooting Guide for Cisco Unified CallManager Release 5.0(2)

 

B-2

OL-9420-01

 

 

 

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Contents Case Study Troubleshooting Cisco Unified IP Phone Calls Sample TopologyProcedure Cisco Unified IP Phone Initialization ProcessCisco Unified CallManager Initialization Process Self-Starting ProcessesCisco Unified CallManager Registration Process Cisco Unified CallManager KeepAlive Process Cisco Unified CallManager Intracluster Call Flow TracesCCMStationD stationOutputCallState tcpHandle=0x4fbbc30 Page CCMStationD stationOutputStopTone tcpHandle=0x4fbbc30 Intercluster H.323 Communication Call Flow TracesFailed Call Flow CCMIe H225UserUserIe -- IEData= 7E 00 1D 05 05 80Page OL-9420-01