Actually the problem is not with the ringing tone, but with the dial tone. VG224 plays the outside dial tone when the analo phone is offhook. When the external call access code is dialed ( number zero - all offnet route patterns and translations on CUCM starts with zero ) VG224 keeps playing the dial tone until a second digit is entered. Then it becomes mute. We can dial the rest of the digit and call completes.
Problem is that customer wants the analog phone to have the same behavior of the IP phone. I mean, they want to listen to the inside dial tone when the analog phone is taken offhook , and after they dial the external call access code ( zero - to reach the offnet translations and route patters ) then they want the hear the outside dial tone.
I am not sure if that is a limitation of the FXS ports or if that is supposed to work the same way it does on SCCP IP phones.
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