Information Technology Reference
In-Depth Information
The local-consult method uses a Cisco proprietary transfer method that performs a con-
sult transfer if multiple lines or dual-line configurations are available, but will revert to
blind transfers if only a single line is available. Cisco proprietary transfers work similar to
the H.450 standard. The only problem is this transfer method results in hairpinned calls if
you have non-Cisco IP telephony systems on your network.
Note: You can also configure transfer modes individually for each ephone-dn by using
the transfer-mode <blind/consult> syntax from ephone-dn configuration mode.
Configuring the transfer mode this way uses H.450 standards and overrules the system-
wide setting.
By default, the Cisco router restricts transfers to devices that are not locally managed.
This is usually a good policy, because transferring outside of the company can result in
toll fraud. For example, a user could transfer an outside caller to an international number,
causing the toll charges to be billed to the organization rather than the outside caller. If
you would like to allow transfers outside of the locally managed devices, you can use the
transfer-pattern < pattern > command from telephony service mode, where pattern repre-
sents numbers to which you would like to allow transfers. Example 7-5 configures the
Cisco Unified CME router to allow transfers to 5XXX extensions and local ten-digit
PSTN numbers.
Example 7-5
Configuring CME Transfer Patterns to Allow Outside Transfers
Key
To p i c
CME_Voice(config)# telephony-service
CME_Voice(config-telephony)# transfer-pattern ?
WORD digit string pattern for permitted non-local call transfers
CME_Voice(config-telephony)# transfer-pattern 5...
CME_Voice(config-telephony)# transfer-pattern 9..........
Cisco CCP also allows the configuration of transfer patterns. These are found under
Unified Communications > Advanced Telephony Settings . The simple configuration win-
dow shown in Figure 7-10 allows you to simply click the Add button and add manually
configured transfer patterns directly into the CCP interface.
Configuring Call Park
Typically, when you place a call on hold, you can retrieve the call only from the original
phone where you placed the call on hold. Shared-line systems bend the rules by allowing
you to retrieve the call from any phone with the same shared line assignment. The call
park feature takes this one step further by allowing you to retrieve the call from any
phone in the organization. Call park “parks” the caller on hold at an extension rather than
on a specific line. Any IP phone that is able to dial the park extension number can retrieve
the call.
The call park system works by finding free ephone-dns in the Cisco Unified CME config-
uration that you have not assigned to an IP phone and have specifically designated as a
 
 
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