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Cannot Dial internal/External numbers on 9951 IPPhone on CME

I have a customer with CallManager Express v8.6 on Cisco 3925 with 7975 ipphones and couple of 9951 video phones.

These 9951 are rarely used and customer complained yesterday that they having problem calling out from these phones.

When they lift the handset and press new call and enter the number and press call again nothing happens, but they can use the cancel softkey to cancel the entered number or back softkey to erase the number. Entered number just stay on the screen for a while and reorder tone after few seconds. tried with # and same result, This behavior is for both dialing an external number and internal extension on another 7975 ipphone as well

with onhook or offhook when i dial an internal extension then also the number just stays on the screen and nothing happens

But If i go to call history on this 9951 and select a number to dial, then it works, very strange

Note: incoming calls work fine when calling from another IPphone to this 9951 extension

Appreciate your help on this

See relevant config below

IOS Version 15.0(1r)M13

voice service voip
 ip address trusted list
 allow-connections h323 to h323
 allow-connections h323 to sip
 allow-connections sip to h323
 allow-connections sip to sip
 fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback none
  registrar server expires max 3600 min 120


voice register global
 mode cme
 source-address port 5060
 max-dn 5
 max-pool 5
 load 9951 sip9951.9-3-2-10
 authenticate register
 authenticate realm all
 timezone 21
 voicemail 6789
 tftp-path flash:
 create profile sync 3668643621817555
voice register dn  4
 number 17804
 call-forward b2bua busy 6789
 call-forward b2bua noan 6789 timeout 20
 pickup-group 100
 name Spare
 label 17804
voice register dn  5
 number 17833
 name MeetingRoom1
 label 17833
voice register pool  4
 id mac 5478.1AE1.E85C
 type 9951
 number 1 dn 4
 username 17804 password cisco2
 codec g711ulaw
 no vad
voice register pool  5
 id mac 5897.1ECC.99DD
 type 9951
 number 1 dn 5
 dtmf-relay rtp-nte
 username 17833 password cisco1
 codec g711ulaw
 no vad




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