by olivier | Mar 29, 2010 | CUCM, Lab, Uncategorized
Pay attention that normally the order of the partitionins is always L1,L2,L3, D1,D2,D3 , where Lx are the partitions assosiated to the Line model and Dx are the partitions associated to the Device model.
So this order will give you the order/ priority in case of tie-break !
In the case of CTI Route Point or CTI ports , the order is changed by the following D1,D2,D3,L1,L2,L3 …. Please recall this if you are involved in a troubleshooting with these elements !
by olivier | Mar 10, 2010 | CUCM, Lab, Written Theory
Here is the list with all the Call Manager services:
- Call Manager : Provides call processing
- TFTP : responsible for building and serving files for devices
- Messaging Interface : used with voice mail systems which use SMDI
- IP Voice Media Streaming Application: provides functionality underlying MOH, conferences, MTP, …
- Telephony Call Dispatcher (TCD) : provides hunting group with Auto-Attendant console
- CTL Provider : works with CTL Client to change security mode from nonsecure to secure
- MOH Audio Translator : it converts audio files for MOH utilisation
- RIS Data Collector : collects and distributes real-time information
- Extension Mobility : login/logout features
- CDR Insert : is responsible for CDR operations
- IPMA : Manager/assistant service
- Extended functions : call-back and QRT service
- Serviceability Reporter : generates reports on logged information
- Webdialer : allows web application to make call control
- CAPF : Issues locally Significant Certificates (LSC)
by olivier | Mar 10, 2010 | CUCM, IOS, Lab, Uncategorized, Written Theory
TFTP is the part of Call Manager where you store all phone’s configuration so that you are able to retrieve then at the bootup sequence. TFTP IP Address will be communicated to IP Phones via the DHCP option 150.
by olivier | Mar 9, 2010 | CUCM, Lab, MGCP, Uncategorized, Written Theory
There is two types of security that you can enable with Call Manager
- Mixed mode : In this mode, depending the security configured on each phone, you can have secure calls when both devices are security-enabled and when one of the phones is missing security, your call will be nonsecure.
- Nonsecure mode : As all phones are not set up with security (default configuration), all calls are nonsecure.
When you device to put security on phones , they can support the three following levels:
- Nonsecure mode : secure calls are not supported
- Authenticated mode : the phone will be able to authenticate calls
- Encrypted mode : the phone will be able to support encrypted calls
If you enable the authentication and the encrytion on your network , you are then able to secure the media traffic as well the voice signaling.
If you want to have security on the media flow, it is then mandatory to secure also the signaling as the keys which are used to secure the media traffic are exchanged during the signaling phase.
SCCP messages sent by IP Phones and Call Manager can be secured using TLS, it is the signaling part. Then for the protection of the media traffic so the RTP packets , you will use the Secure RTP which is providing a framework for encryption and authentications of your stream.
SRTP will be also use between your MGCP gateway and your IP Phone but you need to know that your SRTP keys are exchanged in cleartext session between the MGCP gateway and the Call Manager.
