Endpoint '0000f30B0B02': Could not create dialog to invalid URI '0000f30B0B02'

I have registered two endpoints 0000f30A0A01, 0000f30B0B02
and successfully called 200 for “hello world”

But when I tried to call 0000f30B0B02 from 0000f30A0A01, I 've got the following error .

– Executing [101@sets:1] Dial(“PJSIP/0000f30A0A01-00000015”, “PJSIP/0000f30B0B02”) in new stack
[Oct 22 08:17:45] ERROR[2414]: res_pjsip.c:3533 ast_sip_create_dialog_uac: Endpoint ‘0000f30B0B02’: Could not create dialog to invalid URI ‘0000f30B0B02’. Is endpoint registered and reachable?
[Oct 22 08:17:45] ERROR[2414]: chan_pjsip.c:2649 request: Failed to create outgoing session to endpoint ‘0000f30B0B02’
== Contact 0000f30B0B02/sip:0000f30B0B02@;transport=udp has been deleted
== Endpoint 0000f30B0B02 is now Unreachable
[Oct 22 08:17:45] WARNING[2462][C-00000016]: app_dial.c:2578 dial_exec_full: Unable to create channel of type ‘PJSIP’ (cause 3 - No route to destination)
== Everyone is busy/congested at this time (1:0/0/1)
– Auto fallthrough, channel ‘PJSIP/0000f30A0A01-00000015’ status is ‘CHANUNAVAIL’

The version of asterisk installed is v16.6.1. I did configuration as described in “Asterisk: The Definitive Guide, 5th Edition”

You’ve quoted an error message that contains a hint without explaining why that hint didn’t help.

Are you using realtime?

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