Hello, On the Polycom IP 500 Phones, when I press the mic mute button, the mic on the speaker or headset goes muted. However when I press the mic mute button again, the call is terminated by asterisk. Asterisk shows a: WARNING[1236268096]: File channel.c, Line 1296 (do_senddigit): Unable to handle DTMF tone 'f' for 'SIP/####-####' I am using reinvite=no on the phones. After looking through the C file, it is clear where DTMF tones are declared, however, I want to make this one silent. Is there anyway I could alter this file, to simply ignore the tone and continue the call. Also, from a design perspective, should Asterisk natively be more lenient with tones that it doesn't understand, rather than just cutting the call off? Not sure if this would be considered a bug or whether there was some functionality with this that I just am missing? Thanks, Brent