Resolution
To resolve this problem, perform these steps on Cisco CallManager Express:
- Configure all ephone-dn with dual lines
- Configure all ephones with transfer-mode consult
- Remove "transfer-system full-consult" under the telephony-service (if any)
For more information, refer to these documents:
Configuring Call Transfer and Call Forwarding
The Call Park section of Adding features. For more information on setting up phones to work with Cisco CallManager Express, refer to Configuring phones to make basic calls