Cannot control ringing sound and loudspeaker in SIM900

friis

Senior Member
Hi,
I have a SIM900 controlled by a PICAXE 28X2 and a loudspeaker (8 OHM) connected to the EPP female of the SIM900. When I call the SIM900 I get a very shrill ringing sound. When the 28X2 picks up the phone the ringing stops and I can very faintly hear the caller's voice in the loudspeaker.
When the 28X2 calls my mobile phone the phone rings, I answer it, but I can not hear the called's voice in the loudspeaker.
I have tried to control the ringing tone and the loudspeaker with AT+CRSL and AT+CLVL but they have no effect.
Can anyone help?
Best regards
torben
 
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