No one availabe when transfering a call to Ext

[Basemmansor66]

I am facing an issue when agents transfer a call to Extension, but that doesn't happen all the time but sometimes we face this issue, the agents face a message that this extension is not available and routed to the extension's voicemail to leave a message when trying to call the ext they will transfer to, in order to transfer the customer to it.

here is the Asterisk output:

[Sep 11 13:34:47] VERBOSE[38130][C-000245ac] app_dial.c: Called SIP/1149
[Sep 11 13:34:47] VERBOSE[38130][C-000245ac] app_dial.c: SIP/1149-00011ac4 is ringing
[Sep 11 13:34:47] VERBOSE[38141] manager.c: Manager 'sendcron' logged on from 127.0.0.1
[Sep 11 13:34:47] VERBOSE[38142] manager.c: Manager 'sendcron' logged on from 127.0.0.1
[Sep 11 13:34:47] VERBOSE[38143] dial.c: Called 55558600055@default
[Sep 11 13:34:47] VERBOSE[38144][C-000245ad] pbx.c: Executing [55558600055@default:1] MeetMeAdmin("Local/55558600055@default-0000d583;2", "8600055,K") in new stack
[Sep 11 13:34:47] WARNING[38144][C-000245ad] app_meetme.c: Conference number '8600055' not found!
[Sep 11 13:34:47] VERBOSE[38144][C-000245ad] pbx.c: Executing [55558600055@default:2] Hangup("Local/55558600055@default-0000d583;2", "") in new stack
[Sep 11 13:34:47] VERBOSE[38144][C-000245ad] pbx.c: Spawn extension (default, 55558600055, 2) exited non-zero on 'Local/55558600055@default-0000d583;2'
[Sep 11 13:34:47] WARNING[38144][C-000245ad] func_hangupcause.c: Unable to find information for channel
[Sep 11 13:34:47] VERBOSE[38144][C-000245ad] pbx.c: Executing [h@default:1] AGI("Local/55558600055@default-0000d583;2", "agi://127.0.0.1:4577/call_log--HVcauses--PRI-----NODEBUG-----16--------------------)") in new stack
[Sep 11 13:34:47] VERBOSE[38144][C-000245ad] res_agi.c: <Local/55558600055@default-0000d583;2>AGI Script agi://127.0.0.1:4577/call_log--HVcauses ... ----------) completed, returning 0
[Sep 11 13:34:48] VERBOSE[38141] manager.c: Manager 'sendcron' logged off from 127.0.0.1
[Sep 11 13:34:48] VERBOSE[38142] manager.c: Manager 'sendcron' logged off from 127.0.0.1
[Sep 11 13:34:48] VERBOSE[38149] manager.c: Manager 'sendcron' logged on from 127.0.0.1
[Sep 11 13:34:48] VERBOSE[38149] manager.c: Manager 'sendcron' from 127.0.0.1, hanging up channel: SIP/1149-00011ac4
[Sep 11 13:34:48] VERBOSE[38130][C-000245ac] app_dial.c: No one is available to answer at this time (1:0/0/0)

I guess this is what cause this issue, not sure:
[Sep 11 13:34:48] VERBOSE[38149] manager.c: Manager 'sendcron' from 127.0.0.1, hanging up channel: SIP/1149-00011ac4

and to transfer internally I did a dial plan to let me be able to record the extensions calls for only the transfer, not all the time, as below:

exten => _78XXXX,1,Dial(${TRUNKloop}/79${EXTEN:2},,To)
exten => _78XXXX,n,Hangup
exten => _79XXXX,1,Answer
exten => _79XXXX,n,Goto(defaultlog,${EXTEN:2},1)
exten => _79XXXX,n,Hangup

my version:
VERSION: 2.14-889a
BUILD: 230612-0752
Asterisk: 13.38.3-vici