Dial-peer for DN goes down without active phone.
It causes that call forwarding or SNR doesn't works for DN.
sh dial-peer voice summary
AD PRE PASS OUT
TAG TYPE MIN OPER PREFIX DEST-PATTERN FER THRU SESS-TARGET STAT PORT KEEPALIVE
20075 pots down down 440$ 0 50/0/56
ephone-dn 56 dual-line
number 440
label TEST
description 440
name TEST
mobility
snr 400 delay 0 timeout 30
snr ring-stop
snr answer-too-soon 4
allow watch
call-forward all 500
call-forward busy 500
call-forward noan 500 timeout 10
no huntstop
IOS Version 15.5(3)M4.
It works as expected with other versions of IOS (15.1(2)T4, 15.3(3)M3), Dial-peers for DN are always up, even if DN without any configured phone.
