LANCOM VoIP Routers: PBX Functionalities Chapter 3: Configuring the VoIP functions24ENMSN settingBy entering an MSN into an ISDN telephone, you define the telephone numberthat the phone is to react to and the telephone number that is transmitted tothe user being called.The MSN for your ISDN telephone should be the telephone number that youhave entered for the ISDN user under 'MSN/DDI'. In many devices, this settingis to be found in the menu under Telephone settings MSN. Not to be entered as the MSN is the internal telephone number! Usingthe external MSN/DDI enables the ISDN telephone to continueoperating even in case the LANCOM Business-VoIP-Router should fail(’Life-line support for ISDN telephones’ →Page 45).ECT settingECT (Explicit Call Transfer) is the spontaneous connection of two active callsby the user: If you are conducting two conversations, you can transfer the twocallers so that they can then communicate with each other (’Spontaneous callmanagement by the user’ →Page 29).To use this switching option in combination with the LANCOM Business-VoIP-Router, you should activate automatic ECT in your ISDN telephone. Manydevices allow this value to be adjusted in a menu under Telephone settings PBX Functions Auto. ECT.Keypad settingFor ISDN telephones, control sequences use the # and * characters (known as"keypads") to to activate/deactivate features at the exchange such asautomatic call forwarding (call redirection) or callback on busy. Pressing keysduring a call normally generates DTMF tones, which can be used to controlremote computers, for example.To prevent control sequences for features from being transmitted as DTMFtones, activate automatic keypad transmission for your ISDN telephone. Manydevices allow this value to be adjusted in a menu under Telephone settings PBX Functions Keypad.3.3.3 SIP telephonesSimilar to ISDN telephones, SIP telephones also require a setting for thetelephone number that the device is to react to. If the LANCOM business VoIP