Busy tone, when trying to dial with Cisco 7941 Ip-phone

Hello Everybody. I have some problems with a cisco ip phone. The phone was in a bootlop, and i upgraded the firmware, after that it is working fine. I downloaded a sample .cnf file, and modified the basic things. / server address, sip account, ntp-address / It SEEMS works fine, but i think i made a mistake in the configuration file. The phone was successfully registering on my FreePBX server, and i able to call it from another phone. But when i want to call another extension from the phone, i heard the busy signal after i push ANY number, and on the phone screen a “Reorder” sign appearing. This account was used before another client, and everything was fine with it.
When i push the button on the phone, i can see the following lines in the /var/log/asterisk/full
[2021-04-06 12:17:11] VERBOSE[2202][C-00000004] netsock2.c: == Using SIP RTP TOS bits 184
[2021-04-06 12:17:11] VERBOSE[2202][C-00000004] netsock2.c: == Using SIP RTP CoS mark 5
Has anyone seen anything like this?
Thank you for your help in advance.

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