I have tried to setup a mic ( no speaker yet ). i purchased a micro small mic from Amazon and it didn't work due to me not having a power source for the mic. So as i wait for a power adapator heres a little advice..
If setting up your cam outdoors.. make sure all those connectors from the PTZ camera are covered / insulated / protected from Mother Nature ( especially if you get rain/snow ) if its doesn't have a overhang to block Mother.
The x10 site has two size POE devices, if you plan on using the router to power cam, the devices say they power audio/video also so im assuming thats a external mic and/or speaker. There was a Youtube video of someone using a PTZ cam and speaking thru their cell phone and the audio coming out the Cam external mic, so you could talk to the delevery guy if your not at home.
ok thats my thoughts.
UPDATE: its been a minute but i had my mic from Amazon
( VideoSecu High Sensitive Audio Pickup Device External Amplified Tiny Spy Microphone for CCTV Security Camera with Free Warning Decal WD6 )
FYI
Super high gain mini microphones capturing audio evidence for security camera system
Built in on board IC preamp, low noise, high gain and auto level adjustment
Pick up every sound with this super high gain micro audio system
Preamplifier used to increase a microphone's low output voltage to a stronger usable level
RCA connector, free security warning sticker is included
Works like a Bizzy B. I can hear whats said thru my computers speakers. since the mic seems fairly protected it may not need to be in a enclosure since its fairly enclased in rubber.