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ivrwarrior

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  1. We run an IVR hosting service and we sometimes have customers complain about lost DTMF. Our lines are good ol' TDM T1s split off of channelized DS3s from our carriers, so I'm certain we're not losing digits from the carrier. However, invariably, when we ask the customer having issues whether they're using SIP phones, they say, "yeah, is there a problem with that?" Much of the time those digits are being dropped between the SIP phone and the SIP PBX. UDP is nowhere near reliable enough -- even on a LAN -- especially for discrete data like key presses. Your brain can compensate for a lost packet or two causing jitter. Your PBX can't compensate for a DTMF packet that never reaches it.
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