asterisk users - Nov 2006 - Recommend software version for Cisco IOS Gateways and SIP Phones?

We're running Asterisk 1.2 on a network with a Cisco Voice Gateway
(2811) and 7940/7960 SIP Phones, and were wondering what the recommended
software versions on these were.  Currently, we have 12(4)2T4 on the
Voice Gateway, and 7.5 on most of the phones.  Is this a fairly
standard, supportable setup, or should we look for an upgrade?

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