LANCOM 1722 VoIP – LANCOM 1723 VoIP – LANCOM 1724 VoIP – LANCOM 1823 VoIP Chapter 1: Introduction21EN1.4.2 The central position of the LANCOM VoIP RouterLANCOM VoIP Router take up a central position in the switching of telephonecalls between internal and external subscribers over the different channels ofcommunication. Depending on the model and equipment, the devices inter-connect the following communication participants and channels into a com-mon telephone infrastructure. Internal VoIP terminal devices connected to LAN, WLAN and DMZ, suchas SIP telephones and SIP softphones The internal telephone infrastructure with ISDN or analog PBX and ISDNand analog telephones Analog terminal devices, internally connected either into the ISDN net-work via a PBX with a/b ports, or alternatively into the VoIP network overan ATA (Analog Telephone Adapter) External SIP providers and all of the external subscribers attainable viathem Upstream SIP PBXs with all of the internal and external subscribers attain-able through it The external telephone world via an exchange line or upstream PBX, andall of the external subscribers available via the land-line networkVoIP RouterAnalog FAXPSTNISDN PhoneISDNVoIP RouterINTERNETAnalog PhonePOTSPC / SoftphoneSIP PhoneAnalog PBXISDN PBXPC / Softphone PC / Softphone SIP PhoneExample: Sites with ISDN or analog lines
