Good day, I have an ISR router with call manager express, in which are recorded SPA504G and SPA502 phones with SIP protocol, when I press the hold button on models SPA504G the person who called the extension of the phone SPA504G not listening to musi...

Hello to all, I have callmanager express version 4,1, in I registered a telephone model 7920, this telephone it receives and it makes calls without no problem, but when it makes the forward by nonanswer or by occupied to the voice mail, after reading...