In these cases, out-of-band has to be used for reliable DTMF transport.ĭTMF digits are extracted from the (digital) ISDN signal, transported to the remote H.323 party which inserts the DTMF digit into the signal again. in-band provides the most accurate timing reproduction of DTMF, but it is not suitable when a compressing codec is used, e.g. Generally, DTMF can always be transported either out-of-band or in-band. Fiber Repeaters & Wavelength Division Multiplexers (WDM).
Fiber Alarming, Notification, Relay & Control.SFP (Small Form Pluggable) Modules and Kits.
xDSL Products | DSL Modems, DSL VoIP, DSL Router Modems.
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