As we have done this sort of integration for many satisfied customers, The current project you specified can be resolved in two days,
in addition to the cme to asterisk integration we can also integrate CUCM to the asterisk server as well.
we also provide Cisco XML based applications including but not limited to the below given :
1) Phone Lock/UnLock.
2) one-to-one and one-to-many Paging.
3) Separate Directories manageable via web.
4) Push-to-Talk.
5) Whisper/Baby monitor.
6) Weather, Stock, Currency and custom reports on cisco ip phones.
7) on request Caller ID display.
The bid of 140$ is only for the CME to asterisk integration and just to start a relation with a new customer, the above extra features can be developed for some extra amount if needed.
Thanks,