Out of band: This is normally SIP NOTIFY, H245-alpha, or H245-signal. Sometimes rtp-nte is considered out of band, sometimes not. More likely - not.
RFC 2833: It does an out of band style in-band. This means since the DTMF is in the audio stream, none of the signaling devices are notified of the DTMF, which it is more commonly referred to as in-band.
In-band: Actual DTMF frequencies in the audio stream.
Newer Cisco IP phones will support using RFC 2833 directly from the phone. You may want to consider this on your SCCP phone if you're having troubles.
As well - if you do not have an MTP required for your outgoing SIP trunk, SCCP keypad messages will not be converted to RFC 2833.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...