by Olivier | Feb 23, 2010 | Non classé, Written Theory |
802.3af is becoming the world standard regarding Power over Ethernet but Cisco phones are able also to do power inline (also called pre-standard), it was originally the standard developped by them before standardisation.
With pre-standard phone , the Cisco switch is able to see the reflected FLP ( Fast link Pulse) coming back on its port. Then the switch apply the current on the port to power up the device.
With 802.af , the switch (this time, it is more generic) is able to see the current coming back on its port from the Resistive Detection and Classification stage.
by Olivier | Feb 23, 2010 | CCME, CUCM, IOS, Lab, Non classé, Written Theory |
In order to your DHCP to give the TFTP address to your phones , the common configuration is to use the option 150 which is the main and the more expanded concept used for providing your TFTP. It can provide an IP Address as well an array of IP Address.
This is also the code which you are using under IOS configurations.
But in some old implementation , you can find also the option 66 to give the TFTP to the phones . Option 66 is different in the meaning that you must provide a server name so you need to have DNS enabled . Also you can only pass one parameter!!!
So don’t be too disturbed if you see this option 🙂
by Olivier | Feb 23, 2010 | CUCM, Non classé, SCCP, Trace/Monitoring, Written Theory |
In the CUCM traces , you can find a lot of StationInit and StationD .
What are they corresponding ?
(more…)
by Olivier | Feb 22, 2010 | CUCM, Lab, Non classé, Trace/Monitoring, Written Theory |
Real-Time Monitoring Tool (RTMT) runs as a client-side application and uses HTTPS with TCP to monitor device status,system performance,device discovery and CTI Applications in the cluster
by Olivier | Feb 22, 2010 | CUCM, Lab, Non classé, Trace/Monitoring, Written Theory |
For call processing under the CUCM , you can find 2 types of traces :
- System Diagnostic Interface (SDI) : SDI informations are traces from services and logs from run-time event.
- System Diagnostic Layer (SDL) : SDL informations are traces from services as CUCM , CTI Manager and it stores logs state transitions between the node.
Most of the time , SDI traces will be the traces where you can find all stimuli and all interesting call processing traces regarding your phones. With a little knowledge ,it is not very difficult to read these traces
SDL traces are the transition states between the nodes and they are used more by Cisco TAC
by Olivier | Feb 21, 2010 | CUCM, Lab, Non classé, Written Theory |
Just a little reminder to say that the logical decision to route a call is based on the following order:
Route Pattern => Route List => Route Groups => Gateway .
But take also in mind that the configuration order is the reverse path.
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