On a CCM 4.2.X we are not able to transfer calls to external numbers. For example to a mobile phone.Error message sounds rough summary "restricted external transfer". Does anyone knows what to look for on CCM configuration?
You are probably running into this CCM setup, which can be changed as required;
External Call Transfer Restrictions
External Call Transfer Restrictions feature allows the Cisco Unified CallManager administrator to configure gateways, trunks, and route patterns as OnNet (internal) or OffNet (external) devices at the system level. By setting the devices as OffNet, administrators can restrict the transferring of an external call to an external device and thus help prevent toll fraud.
To activate external call transfer restrictions, perform the following steps:
Set the Block OffNet to OffNet Transfer service parameter to True.
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