I'm looking for recommendations from folks for a VoIP intercom. The intercom will be installed on an outdoors security gate, and as such must be tamper/dust/water proof. Ideally it will connect to a SIP phone or IP speaker in some nearby indoors office.
The following product looks ideal (basic, but would do the job just fine) but is presently out of stock:
Any suggestions similar to this model or advice otherwise would be great.