I viewed he data sheet of CP7941 IP phone but find no G.722 codec supported on it.
But when I called with 2 CP7941 in LAN, the codec showed on the both phones is G.722.
I believe the codec should negociate between the end points, but why it was G.722 even the endpoints does not support the codec？
Dont it cause by the phone firmware ? The firmware we use is SCCP41.9-2-3S for SCCP phones.
Data Sheet of CP7941
Thanks for the reply in advance.
Solved! Go to Solution.
Yes, it support G.722
You will also need a wideband handset or headset for the feature to fully work.
Thanks Paolo !
But why the g.722 codec is not listed on the data sheet ?
So the supported codec depends on the hardware model but not the firmware, right ?
Paolo is most correct. +5 "P"
Here is a different doc with different info.....happens all the time
with Cisco docs;
If Cisco Unified CallManager has been configured to use G.722 (G.722 is enabled by default for Cisco Unified IP Phone Models 7941G, 7941G-GE, 7961G, 7961G-GE, 7970G, and 7971G-GE; other phone models may not support it), and the far endpoint also supports G.722, the call will be connected using the G.722 codec in place of G.711. This occurs regardless of whether the user has enabled a wideband headset, but if the headset is enabled, the headset user may notice greater audio sensitivity during the call. Greater sensitivity means improved audio clarity but also means that more background noise can be heard by the far endpoint—noise such as rustling papers or nearby conversations. Even without a wideband headset, some users may prefer the additional sensitivity of G.722; conversely, some users may be distracted by the additional sensitivity of G.722.
Two parameters in Cisco Unified CallManager Administration affect whether wideband is supported for this Cisco Unified CallManager server and/or a specific phone:
•Advertise G.722 Codec—Choose Cisco Unified CallManager Administration > System > Enterprise Parameters. The default value of this enterprise parameter is True, which means that all Cisco Unified IP Phone Models 7941G, 7941G-GE, 7961G, 7961G-GE, 7970G, and 7971G-GE that are registered to this Cisco Unified CallManager will advertise G.722 to Cisco Unified CallManager. If each endpoint in the attempted call supports G.722 in its capabilites set, Cisco Unified CallManager will choose that codec for the call. For more information, see the Cisco Unified CallManager 5.1 Release Notes.
•Advertise G.722 Codec—Choose Cisco Unified CallManager Administration > Device > Phone. The default value of this product-specific parameter is to use the value specified in the enterprise parameter. If you want to override this on a per-phone basis, choose Enabled or Disabled in the Advertise G.722 Codec parameter on the Product Specific Configuration area of the Phone Configuration window.
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