Multi-Tech Systems E1 ユーザーズマニュアル

144 

16. Set Supplementary Services Parameters.  This dialog box can be 

reached by pulldown menu, keyboard shortcut, or sidebar.   

 

 

 

 

 

Supplementary Services features derive from the H.450 standard, 

which brings to voip telephony functionality once only available with 

PSTN or PBX telephony.  Supplementary Services features can be used 

under H.323 only and not under SIP.  Even though the H.450 standard 

refers only to H.323, Supplementary Services are still applicable to the 

SIP and SPP voip protocols.