13/05/2008, 13:56
The Cisco UC 520 has 8 PoE ports out of which you can draw 88 watts of power. This means that with each Cisco IP phone drawing 12 watts of power, you can only have 7 IP phones (= 84 watts) on the 520.
If you don’t know this it can be quite hard to troubleshoot, because the phone doesn’t get enough power to create a link, so it looks as if the port itself is dead.
If you are planning to implement the UC 520 in an environment with exactly 8 phones, remember to add the companion switch to the solution so that you have enough power to support all phones.
09/05/2008, 08:52
H.450 is an umbrella protocol to support supplementary services in H.323.
It is subdivided into
- H.450.1 Generic functional protocol for the support of supplementary services in H.323.
- H.450.2 Call Transfer supplementary service for H.323.
- H.450.3 Call diversion supplementary service for H.323.
- H.450.4 Call Hold supplementary service.
- H.450.5 Call Park supplementary service.
- H.450.6 Call Waiting supplementary service.
- H.450.7 Message Waiting Indication supplementary service.
- H.450.8 Calling Party Name Presentation supplementary service.
- H.450.9 Completion of Calls to Busy Subscribers supplementary service.
- H.450.10 Call Offer supplementary service.
- H.450.11 Call Intrusion supplementary service.
- H.450.12 ANF-CMN supplementary service.
In Cisco CME it is important to remember to enable H.450.12 in addition to the default subprotocols for redirection of calls to work.