I am wondering what module should be used to connect DID with my TDM2400P? According to what I know, it should use FXO module to connect the POTS.
However, when the telco technician try to connect the DID to my Asterisk box, he stated that my Asterisk box should be able to have some voltage to be given out in order to connect the DID. He also stated in order to test the DID interface, it should be able to hear some dial tone when an analog phone is attached to it.
From some of the info. on the internet, the dial tone is produced from an FXS module to signal the analog phone attached to it.
Therefore, it confused me which module should be used in my TDM card to connect the DID.
Thanks in advance.