We have Polycom VVX and CX 5500 phones that cannot dial 911. We use Lync for dialing plans which adds a + to 3 digit calls. What is odd is dialing 411 works, just not 911. Also the CX600 phones work fine calling 911, the + is added. It appears it is something wrong with the configuration of the UC software. We currently do not have dialing plans defined in the phone configuration file because Lync is handling it. This works for everything except calling 911 on the VVX and CX5500 UC phones.
Any advice is appreciated. Thanks