Switching from Asterisk1.2 to Asterisk1.4


i want to know about the possible threats or issues while switching an existing PBX already developed on Asterisk 1.2 to latest version Asterisk 1.4.What modifications will b required and what incompatibilities exist in two versions?

Please share experiences if anyone is doing or have done this job.

Thanks in advance,

wasn’t there a thread posted in the last 2 days asking this ?

in the 1.4 source, look for, and read, then read again the files README, UPGRADE.txt and CHANGES