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afterthenumber

Thoughts and experiences of a Cisco Collaboration engineer after clearing the CCIE lab…

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    Tag: dtmf

    Troubleshooting DTMF from ISDN PSTN

    Sometimes we unfortunately still have legacy requirements to support ISDN that still need to upgrade to SIP Trunking.  DTMF and even fax tones can be a pain… Read more “Troubleshooting DTMF from ISDN PSTN”

    March 14, 2016March 18, 2016 by jonathan

    DTMF Interworking and the MTP

    I came across this a while back when deep diving MTP when preparing for the lab.  I’ve pretty much got it down now, but I keep coming… Read more “DTMF Interworking and the MTP”

    August 8, 2015March 23, 2016 by jonathan
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