3Com® VCX V7111 VoIP Gateway User Guide 151Parameter DescriptionEnable SMDI[SMDI]Enables the Simplified Message Desk Interface (SMDI) on thegateway.Disable [0] = Normal serial (default).Enable [1] = Enable RS-232 SMDI interface.When the RS-232 connection is used for SMDI messages(Serial SMDI) it cannot be used for other applications, forexample, to access the Command Line Interface.SMDI Timeout[SMDITimeOut]Determines the time (in msec) that the gateway waits for an SMDI CallStatus message before or after a Setup message is received. Thisparameter is used to synchronize the SMDI and analog interfaces.If the timeout expires and only an SMDI message was received, theSMDI message is dropped. If the timeout expires and only a Setupmessage was received, the call is established.The valid range is 0 to 10000 (10 seconds). The default value is 2000.Protocol Management ini File ParametersTable 49 describes the SIP Protocol Management parameters that can only be configuredusing the ini file.Table 49 Protocol Management, ini File Parametersini File Parameter Name Valid Range and DescriptionEnablePtime 0 = Remove the ptime header from SDP.1 = Include the ptime header in SDP (default).IsUseToHeaderAsCalledNumber 0 = Sets the destination number to the user part of the Request-URI for IPÆTel calls, and sets the Contact header to the sourcenumber for TelÆ IP calls (default).1 = Sets the destination number to the user part of the To headerfor IPÆTel calls, and sets the Contact header to the usernameparameter for TelÆIP calls.SIPSRequireClientCertificate 0 = The gateway does not require client certificate (default).1 = The gateway (when acting as a server for the TLS connection)requires reception of client certificate to establish the TLSconnection.The SIPS certificate files can be changed using theparameters HTTPSCertFileName andHTTPSRootFileName.Send180ForCallWaiting 0 = Use 182 Queued response to indicate a call waiting (default).1 = Use 180 Ringing response to indicate a call waiting.NumberOfActiveDialogs Defines the maximum number of active SIP dialogs that are notcall related (that is, REGISTER and SUBSCRIBE).The valid range is 1 to 5. The default value is 5.
