As Paolo says, some users have reported issues with the 187 - including problems with fax, and also general stability / lockup issues. I generally use FXS ports in ISR gateways for analog devices - however this does require suitable cabling to be available (analog devices need cable runs back to the ISR).
No FXS ports made by cisco supports release trigger or dry contact, neither they are supposed to. These are precisely features provided by the door opener/intercom interfacing device, that has to be purchased separately, not the phone interface. Once said device it detects a a certain DTMF it will activate the contact or perform other functions.
Once again, I'd recommend you locate and work with a reputable consultant, or UC certified Cisco partner, to avoid further confusion.
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