Problems registering Audiocodes 310HD

I am having problems registering a IP phone (Audiocodes Model 310HD) as you can see in the following lines of the Asterisk log file:
[2018-03-09 12:53:16] NOTICE[1682] res_pjsip/pjsip_distributor.c: Request ‘REGISTER’ from ‘sip:[email protected]’ failed for ‘’ (callid: 87c680-b00a8c0-13c4-50029-5aa283bc-4d8d24d1-5aa283bc) - Failed to authenticate

The extension is configured as PJSIP technology listening on Port 5060 (UDP)

Try using a smaller secret/password, some phones don’t like long passwords.

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