Cisco Cisco IOS Software Release 12.2(2)XK

This section describes open caveats in Release 12.2(2)XK2.

Pulse dialing is not supported on ASI or MRP analog interfaces when using MGCP. (CSCdv30796)

There is no workaround.

If you are using MGCP on an ASI or MRP FXO-M1 interface, battery-reversal answer supervision 
is not supported. (CSCdv43225)

There is no workaround.

Connections over T1 endpoints might experience unacceptable levels of background white noise, or 
“hiss,” if Voice Activity Detection (VAD) is enabled on the MRP card. VAD, which is enabled by 
default, causes the Cisco IP Phone 7960 to generate a low level hiss to simulate the background 
circuit noise users experience on non-IP connections. (CSCdr31192)

Workaround—Disabling VAD can solve this problem, however, if you disable VAD on a network 
that exhibits a significant amount of jitter (for example, greater than 100 milliseconds per second), 
latency becomes noticeable to the user in the form of delay and packet loss. Also, if the codec clocks 
are out of sync among the devices participating in the call, latency increases for the duration of the 
call. For example, if the codec clock at the transmitting end is 100 parts per million faster than the 
codec clock at the receiving end, latency increases to one-half second over the course of a one hour 
long connection (at 8 kHz).

When placing a call through an MRP card to an IVR system, greeting messages played by the IVR 
might be clipped. (CSCds04904)

There is no workaround.

The following sections describe the documentation available for the Cisco ICS 7750. Typically, these 
documents consist of hardware and software installation guides, Cisco IOS configuration and command 
references, system error messages, feature modules, and other documents.

Documentation is available as printed manuals or electronic documents, except for feature modules, 
which are available online on Cisco.com and the Documentation CD-ROM.

Use these release notes with the documents listed in the following sections:

The following documents are specific to Release 12.2 and apply to Release 12.2(2)XK2. They are 
located on Cisco.com and the Documentation CD-ROM:

Release Notes for Cisco IOS Release 12.2(2)XK2