With the police log I see in my hometown newspaper there seem to be quite a few 911 calls that come in, perhaps from mistakes or propagation freaks, that come in for other jurisdictions and they simply get the information and pass it on to the PSAP for the proper jurisdiction. The other jurisdiction may be just another county, a city not too far away, Indian police, or the highway patrol. I think they probably just call the other jurisdction by landline or go on the other jurisdiction's radio frequency if it's close enough. The city police and sheriff's office recently combined their answering points, so they no longer have to transfer calls from the city to the county or v.v.
-- Wes Leatherock snipped-for-privacy@aol.com snipped-for-privacy@yahoo.com