Gatekeeper Multicast Discovery
Endpoints which are using multicast discovery will use the multicast adress 224.0.1.41 for GRQ
H.323 Caller ID on FXS ports
In H.323 , you can play with the caller id (not the case with MGCP , see previous post).
By default,Caller ID is disabled on all FXS ports.
So in order to enable it , you must go under the voice-port and activate it as it is shown in the below config
!
voice-port 2/0
caller-id enable
!
MGCP Called ID on FXS ports
Caller ID is not supported on MGCP Controlled FXS ports.
So remind this if you need it 🙂
MIC,LSC, Security Endpoints
Regarding security endpoints, you have 2 opportunities :
- Newer phones are using more an existing Mafufacturing Installed Certificate , this is the MIC
- Meanwhile , old phones will use a Locally Significant Certificate ( LSC) which will be installed by the Certificate Authority Proxy Function (CAPF)
As LSC must be a transaction between the Ip phone and the CAPF , here is the process as it is issued :
- IP Phone generates a public/private key pair
- A TLS Session is established with the CAPF Service and the keys and identity are sent from the phone to CAPF
- The CAPF Service creates and sends an LSC to the phone
- The IP Phone installs the LSC
Also for info, the CAPF Service must be in the phone CTL file , which is downloaded from the TFTP when the phone boots .
CAST – Cisco Audio Session Tunnel
Cast is the protocol used into the conversation between the webcam and your IP Phone.
It uses TCP/4224 in both direction ( easy to implement if you are firewalling your networks).
Pay also attention that the communication is only between the IP Phone and the webcam . CUCM is not involved at all in that “conversation” except for the TFTP config download.