Dropping incompatible voice

what meanse this notice

NOTICE[23138]: channel.c:3137 __ast_read: Dropping incompatible voice frame on SIP/telnet1-00000016 of format ulaw since our native format has changed to 0x100 (g729)

NOTICE[23126]: channel.c:3137 __ast_read: Dropping incompatible voice frame on SIP/telnet1-00000015 of format ulaw since our native format has changed to 0x8 (alaw)

Actually not much.
There’s neverthless a entry in the Asterisk-buzgtracker and if I remember right, also a solution.
Meanwhile You may just ignore this message.

so it not a big problem i can use my asterisk

NOTICE means it is not an error. These are normal and ingorable, providing you get no more than a few per call.

set sip.conf

disallow=all
allow=all

this will solve this problem

It’s not a problem.