How to configure VoIP using a variety of methods: VoIP telephopny setup dialog, manual configuration of the router for Cisco CallManager Express , a partically automated process, Quick Configuration Tool and Cisco Network Assistant.
1 IP Telephony IP Addresses
No matter what method of configuration is used, a Cisco IP Phone needs an IP address and a configuration file to operation, An IP address i s normally assigned using DHCP, a DHCP pool of addresses can be created on the router or on a separate server.
In these labs, the DCHP pool is created on the router,When either method is used, the CME router has to be able to let the phone know the IP address of the router or server that can provide the IP address, This is true even if the IP address is the same router that is providing CME.
2 DHCP Option 150
The Cisco IP Phone uses DHCP option 150 to identify the location of the device that contains the IP Phone's configuration fiel ,The Cisco IP Phone receives its configuration file from a TFTP Server, DHCP can be used to let the IP Phone know the IP address of the device that contains the phone configuration file, This IP address is a TFTP server and it can be located on the router providing CME.
In the DCHP pool configuration process on the router, this option 150 parameter must be configured , or the Cisco IP Phone will not funcation.
3 PC IP Addressing
If a PC is to be used it, too, needs an IP address, If the PC is using DHCP,the DHCP pool needs to be a different one from the pool used for the IP phones.
4 ephone-dn
when dealing with CME, an IP Phone is configured using the ephone option , the term ephone is short for Ethernet phone, The telephone line assicicated with the ephone in known as an ephone-dn, which stands for Ethernet phone directoru number.
The ephone-dn represents a line that connects a voice channel to a phone so that calls can be made, when you enable the VoIP telephony services, ephones and ephone-dns can be created and seen in the running coniguration output.
An ephone-dn has one or more extensions or phone numbers associated with it that allow calls to be made
An ephone-dn is similar to a phone line , Each ephone has a number to indentify it during the configuration process.
There are two types of ephone-dns:
1 Single-line: The single line option should be used when phone buttons have a one-to-one correspindence to the regular phone lines that come into a CME system. The dula-line option lets you make two call connections at the same time using one phone line buttion.
2 Dual-line: Dula-line Ip Phones have one voice port with two chnannels to handle two independent calls, This capability enables call waiting , call transfer and conference funcations on a phone-line buttion, In dual-line mode ,each IP Phone and its associated line button can support one or two calls. you select one of two calls on the same line using the Navigation button located below the phone display.
The objectives of this map are as follows:
Cable two Cisco IP Phones to a switch/switch module
Provide power to the phones using eithor method
Configure Cisco CallManager Express
Configure Two IP Phones using the telephony-service setup
Verify IP Phone registration and connectivity.
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