by Olivier | Mar 10, 2010 | CUCM, Lab, Non classé, 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 | Non classé, Trace/Monitoring, Uncategorized, Written Theory |
Here are a list of the different tools that you can use :
- CDR Analysis and Reporting tool (CAR) : is used to generate CDR reports and so on
- DBHelper : is used to fix SQL replication issue
- Dialed Number Analysis (DNA) : is used to analyze your dial plan
- Dick Tracy : is a catalyst troubleshooting tool
- Event viewer : Windows system tool to see application, system and security events
- Perfmon : Windows system tool to see and monitor counters in real-time
- Q931 Translator : it is a tool to decode Q931 messages of the ISDN/H323 stack
- Quality Report Tool (QRT viewer) : it is a reporting tool for quality purposes
- Real-Time Monitoring Tool : is an extended plugin which can view Call Manager Serviceability counters in real-time
- SDI Traces : CCM traces which provide detailed diagnostic information relative to call processing , registration,digit analysis, call flows and all protocols related and so on
- SDL traces : These are traces which are the transition levels between all nodes. It is essentially used by the tac
- SQL Enterprise Manager : it is the SQL console tool
by Olivier | Mar 10, 2010 | Non classé, Uncategorized, Written Theory |
As for fax-relay, the gateway demodulates the signal sent by the modem and send it over IP network by using the Simple Packet Relay Transport (SPRT) protocol. The remote gateway process it at the reverse side.
Modem pass-through is similar to pass-through as everything is sent in-band.
by Olivier | Mar 10, 2010 | Non classé, Uncategorized, Written Theory |
Store-and-forward fax on IP networks operates like email and so can deliver to servers or remote fax.
T37 is the ITU standard for store-and-forward fax transmissions.So a fax is converted into a TIFF attachment and sent to the network (it is the onramp gateway).Then the TIFF is sent to a server or an offramp gateway.
by Olivier | Mar 10, 2010 | H.323, IOS, Lab, MGCP, Non classé, Uncategorized, Written Theory |
Real-time fax over IP operates in a similar way of a regular fax transmission. The fax machines involved in the transmission synch up and then the fax data is sent between them over the intervening IP Network.
There are 2 methods of transporting fax in real time across the network:
Fax-relay
Fax-passthrough
When using fax-relay, the T30 fax signal from a connected fax machine is demodulated by the sending fax gateway and sent over the IP Network to a remote fax gateway. The remote fax gateway then recontructs the T30 fax signal and send it to the fax.
There are 2 types of fax-relay mechanisms:
Cisco fax-relay
T38 fax-relay
Cisco fax-relay is an older method. So a fax gateway terminates T30 fax tones from a local fax machine and then sends the fax data across an IP network by breaking the tones into HDLC frames and then transmitting them using RTP.
T38 fax-relay is the ITU standard T30 fax signal, it is demodulated at the local gateway and encapsulated into IP packets for transport over a network to a remote fax gateway which will then reconstruct the signal and play it to the fax. T38 includes also a mechanism by which a fax gateway can inform the remote gateway of its desire to change the media type from voice to data. T38 can also use TCP or UDP connections but will use more UDP.
For fax pass-through, modulated fax data is sent in-band across the IP network by a fax gateway using a voice codec (like G711 without any VAD or echo-cancellation). Also with fax pass-through, T30 fax calls are not distinguished from regular voice calls, they are simply sent in-band over the IP Network. With the fax detection tones, the gateway must be able then to switch to high-bandwidth codec. Fax pass-through is relatively bandwidth hungry and is sensitive to delay,jitter and packet loss
by Olivier | Mar 10, 2010 | Non classé, Uncategorized, Written Theory |
Call Manager 4.X supports video calls between SCCP and H323 endpoints. Call Manager can support point-to-point video calls between endpoints and if you want to enable the conferencing features then you need to use a Multioint Control Unit (MCU).
Standard voice point-to-point calss involve two RTP streams, and video calls can involve up to six streams. 2 RTP streams for Audio, 2 RTP streams for Video and 2 RTP streams fro Far End Camera Control (FECC) (used for security purposes).
The different video codec are :
- H261 : ITU standard which operates between 40 Kbps and 2Mbps and supports CIF 352 x 288 or Quarter CIF – QCIF 176 x 144
- H263 : It is a low bitrate codec used for SIP and H323 networks (MPEG-1 and MPEG-2)
- H264 : is a great improvement over H263, it is also known as MPEG-4 and Advanced Video Coding (AVC). It permits also the compression of the video in a distinctive way.
- Cisco proprietary wideband
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