Aastra OpenCom 131 User Guide - Page 109
Fundamentals, System, Licences, System Info, Telephony, SIP phones, Reset
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Voice over IP (VoIP) Fundamentals A configuration dialogue of SIP telephony software 7. You can only conduct a certain number of telephone calls simultaneously with internal SIP telephones. The number licenced can be viewed on the System: Licences page. The number of SIP telephones currently licenced can be determined on the System Info: Telephony: SIP phones page. If you click on Reset licences, the available licences will be reassigned with the next incoming or outgoing calls. 9.2 Fundamentals VoIP makes the transmission of voice and telephony signalling via IP ("Internet Protocol") possible. After a connection is established, the terminal collects voice data (PCM data), which is then sent to the receiver using an IP packet. PCM data can also be compressed to save bandwidth. 107