Why is there a short beep in the handset of the Panasonic TGP500+Astertisk sip phone?

Question

Telephony

There is an Asterix server used to call through a softphone. We decided to buy tubes. We bought a Panasonic KX-TGP 500.
The web interface says that an even entry is registered, but when I try to make a call, there is a short beep in the handset.
From a softphone - calls normally, on the same account.
I set up a test account sipmarket.net on the handset - the calls go through.
And with a bunch of handset + Asterisk - short beeps on an outgoing call.
What to do? What settings to check?

Answer 1

The problem disappeared after changing the protocol settings. TCP was installed on the phone and UDP-Primiry in Asterisk, although TCP also had to work. After I chose TCP-only in Asterisk, everything worked.