Knowledgebase Article
| Knowledgebase > Unified Communications > SmartNode > SmartWare |
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| Is DTMF supported in SmartWare? | |||
| Article Id #: 85 | |||
Yes. Generally, DTMF can always be transported either out-of-band or in-band. in-band provides the most accurate timing reproduction of DTMF, but it is not suitable when a compressing codec is used, e.g. G.729 or G.723. In these cases, out-of-band has to be used for reliable DTMF transport. DTMF digits are extracted from the (digital) ISDN signal, transported to the remote H.323 party which inserts the DTMF digit into the signal again. The latter may cause problems when compression codecs are in use which may distort the DTMF signal such that a receiving IVR application is no longer able to decode the signal properly. In SIP: You can choose between RFC2833 transport of DTMF, within the real-time data (default and most commonly used), or you can choose to have DTMF sent as SIP INFO messages - this way a SIP proxy that does not route RTP traffic will be able to see it. You can find this settings in the VoIP Profile. |
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