I have several offices that are running SPA 504G and 525G phones both running 7.4.4 firmware. I am using an XML Directory service to share extension numbers between offices and initially everything seemed to be working fine with this. However, once I...

I recently replaced an old StarPlus phone system with Asterisk and SPA504 phones. According to the spec sheet the 504 is hearing aid compatible but a user is having problems on the new phone. She is complaining of squealing and other hearing issues o...