• By default if the call park is not picked up, it will be returned to the call park originator.
• After parking a call, the phone that parks the call can retrieved it back by pressing “Park” follow by “*”
• Other phones can pickup the call by pressing “Pickup

• SCCP phones support the Pickup soft key for Park Retrieval only if the service directed-pickup command is configured (default). Otherwise, the Pickup soft key initiates Local Group Pickup. See CCME Call Pickup
• Probably better to dial the park slot extension to retrieve the call as it will work all the time.

• Enables the Call Park and Directed Call Park features supported in Cisco Unified CME 7.1 and later versions.
• This also includes the support for shared call park number between SCCP and SIP phones

telephony-service 
  call-park system application

• Designate certain DN as park number
• Ephone-dn 10 and Ephone-DN 11 can by anyone who parks a call
• A call parked on ephone-dn 10
  • A reminder is sent every 10s
  • After 3 reminder, the call is returned to the sender
• A call parked on ephone-dn 11
  • A reminder is sent every 10s
  • After 3 reminder, the call is transfer to extension 1003
  • if the extension 1003 is not currently ringing or connected. As an alternate, the transfer will use 1004

ephone-dn 10
  number 1200
  park-slot timeout 10 limit 3 recall
!
ephone-dn 11
  number 1201
  park-slot timeout 10 limit 3 transfer 1003 alternate 1004

• The Directed Call Park feature allows a phone user to transfer a call to a specific call-park slot using the Transfer soft key.
• In Cisco Unified CME 4.0 to Cisco Unified CME 7.0, users retrieve a call from a directed call-park slot by dialing the park-slot extension or using the PickUp soft key and dialing the park-slot extension.
• In Cisco Unified CME 7.1 and later versions, users retrieve a call from a directed call-park slot by dialing a Feature Access Code (FAC) follow by the number of the call-park slot.
  • Standard FAC for dpark-retrieval is *0
  • Assuming directed park number is 3001
  • To pickup directed call park, dial *03001

ephone-dn 10
  number 1202
  park-slot directed

• Define FAC code to retrieve park call
  • Standard is *10

telephony-service
  fac {standard | custom dpark-retrieval <custom-fac>} 

Reserved for an extension

• Ephone-dn 12 is reserved for 1001
• Ephone-dn 13 is reserved for 1002
• If the call is not retreived after 100 seconds, it will be dropped.

ephone-dn 12
  number 1202
  park-slot timeout 10 limit 10 reserved-for 1001
ephone-dn 13
  number 1203
  park-slot timeout 10 limit 10 reserved-for 1002

Reserved for a group

• Assign group to call park dn
• Assign same group to phone dn

ephone-dn 14
  number 1204
  park-slot reservation-group 1
!
ephone 1
  park reservation-group 1
!
voice register pool 1
  park reservation-group 1

• Block call park for certain phone
  • Only block using the transfer button to park slot but does not block the use of the Park softkey to park the call

ephone 1
  transfer-park blocked

• Display call-park slots and their status

Router# show ephone-dn park 

DN 50 (1560) park-slot state IDLE 
Notify to () timeout 30 limit 10 

• observe messages and states associated with an ephone.

Router# debug ephone