CCNA Voice Study - Integration Models

PBX- Traditional model, phones all have a unique DN perhaps DIDs. Calls come into a receptionist for direction and users must use an access digit of sorts like 9.

Keyswitch – Model in which all phones have a common lines on all of them. All users can see when a line is in use and intra-office calls are rare.

Hybrid- All phones have common lines in addition to a unique one.

Debuging H323 Dial-Peers

Today has been a long day. I’ve been trying to get 4 analog DID, and 4 analog DOD lines working on a 2811 with one FXO and one FXS DID card. Some very useful debug commands in this process have been.

debug voip dialpeer all
This allows me to see when I place an outbound call what Dial-peer it is actually hitting and all the detail about it.

Debug vpm all
This gives me the debug output from the FXO and FXS cards. In my case it’s telling me I need to get a hold of the phone company. The lines are supposed to be Ground-start however when my FXO goes off hook it never sees the circuit complete and then just drops the call.

CCNA Voice Study - Licensing Requirements

IOS License – Straight forward the license for the version of IOS you will be running on the ISR.

Feature License – Is the number of phones that the CUCME will be able to support. Think of it as attached to the ISR verses the phone.

Phone User License – Is the actually license for use and operating the phone. Think of it as attached to the phone verses the ISR.

Licenses can be added incrementally so you could buy a 24 phone license and later purchase a 48 phone license for a total of 72 usable phones.