[asterisk-users] TDM400P won't ring GM phone of mere 0.1B

[yliu11 at hotmail.com]

This is rather bizarre: My TDM11 (one FXS) rings a $10 passive phone with REN of 1.0B, a cheap speaker phone of 0.3B, and a cordless phone with marked REN of 0.0B.  But it couldn't properly ring this 27935GE3-B (FCC ID G9H2-7930) cordless phone rated at merely 0.1B.  Rarely, the phone will crack out an occasional weak and abrupt beap, but never a normal ring.  Otherwise Asterisk and TDM400P works with this phone, dialing, voice, callerID and all that. (In fact, when the FXS "rings", the display lights up as it should.)

This is a dual-line 2.4 GHz cordless phone.  It rings normally when plugged into wall jack.

Any idea?  Though not described in the manual specifications, Table B1 suggests that an FXS module (S110M?) supports at least REN 3.

Yuan Liu