How can i fix that

Allow a codec, which the peer supports.

Without both your relevant configuration, and either the actual SDP, or the log line listing the offered and acceptable codecs, I don’t think one can be much more precise.

Please note that chan_sip should not be used on new configurations, as it is not supported by Sangoma.

i’m use a CSipSimple app for mobile

I meant the configuration of Asterisk, i.e. what is in /etc/asterisk

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