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19 Billing mit Asterisk.............................................................................212
19.1 ASTPP.......................................................................................213
19.2 Asterbill......................................................................................214
20 Asterisk und Instant Messaging........................................................215
21 Alternativen zu Asterisk.....................................................................216
21.1 Skype.........................................................................................216
21.2 SipX...........................................................................................218
21.3 Swyx..........................................................................................221
21.4 Leistungsstarke Softswitches....................................................222
21.4.1 Cirpack Softswitch..............................................................222
21.4.2 Siemens SURPASS...........................................................224
22 Danksagung und Literaturverzeichnis...............................................225
23 Anhang Asterisk Funktionsliste.........................................................226
23.1 Sprachsfunktionen.....................................................................226
Computer-Telephonie Integration (CTI)............................................228
23.2 Skalierbarkeit.............................................................................228
23.3 Codecs.......................................................................................228
23.4 Protokolle...................................................................................229
Traditionelle Telefonie Interoperabilität.............................................229
23.5 PRI Protokolle............................................................................230
24 Anhang VoIP Protokolle....................................................................231
24.1 SIP ­ Session Initiation Protocol................................................231
24.1.1 Transfer mit SIP.................................................................234
24.2 IAX.............................................................................................235
24.3 H.323.........................................................................................236
Vergleich zwischen H.323 und SIP..............................................237
24.4 MGCP........................................................................................238
24.5 Megaco/H.248...........................................................................239
25 Anhang PSTN ­ Public Switched Telefon Network...........................240
26 Anhang Glossar ................................................................................242
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