Hi,
Can a SIP UA send and receive out of band DTMF digits if it does not support
rfc2833?
Not all RTP machines support rfc2833 and they still want to convey
out-of-band DTMF with other vendors. when working with voice codecs like
G.723.1 & G.729.
(equivalence for H.323 H.245 userInputIndication alphaNumeric element).
The INFO spec RFC 2976
Say:
1.1 Example Uses
The following are a few of the potential uses of the INFO message:
- Carrying mid-call PSTN signaling messages between PSTN
gateways.
- Carrying DTMF digits generated during a SIP session.
- Carrying wireless signal strength information in support of
wireless mobility applications.
- Carrying account balance information.
But there is no specification of what is the standard way to do that.
This gives H.323 a huge advantage over SIP in the market.
Thanks,
Eran.
Eran Shen
Intel Corporation
Telecommunications and Embedded Group
P.O Box 58, Migdal Tefen, Israel
Tel: +972-4-9105020
<mailto:[EMAIL PROTECTED]>
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