Can't sending faxes

I’m relatively new to Asterisk, but my Telephones are working fine, and i can recieve faxes.
But the Fax sending dosen’t work and i have no idea whats wrong.

Logfile ->

Hopefully someone can help me.

Your provider is signaling that they do not accept your call.

SIP/2.0 488 Not Acceptable Here

Check what codecs they support, it’s possible they do not permit T.38

According to the documentation of the provider T.38 schould work.
I also play a little bit with the codecs, but it also dosent work.
Which codec shuold i use?

Ok i tried it again with “allow=!all,alaw” and it worked very well, thanks for the hint!

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