Digit map controlling the transmission of dialed digit information. The string defines the criteria to be met as digits are collected before an outgoing request (e.g., a SIP INVITE) can be initiated. The syntax of this parameter is exactly the syntax used by MGCP as defined in RFC3435, section 2.1.5. This parameter is applicable only if the device supports a dialing mechanism for which a dialing plan is needed (for example, a device with an explicit Dial button may not need to be aware of the dialing plan) and if the device does not already support a dialing plan mechanism for this profile (e.g. in-band via MGCP). If this object is supported, the capability VoiceService.{i}.Capabilities.DigitMap MUST be equal to true. Applicable only for a VoIP endpoint.