The phone or SIP Device is not set for G711u CODEC priority - In some cases the CODEC priorty may be changed or altered for some reason and not be set to G711u as the priorty codec. Ensure that the phone is set for strict and only RFC2833 Both Inband and SIP INFO are very unreliable. There is inband DTMF, SIP INFO and RFC2833. The Phone or SIP device is not set for RFC2833 DTMF Transport Method - There are three choices for DTMF transport, though most phones and SIP devices default to RFC2833 today. If not a cell phone, a SIP originated call into the Strategic Voice Solutions IVR maybe from a platform utlizing poor choices like G.729 codecs with SIP INFO DTMF transport methods or simply very low cost grey routes with poor quality.Ģ) For outbound calls to services or companies with IVR's, this can be tied to several possible issues: In this event, either pressing the digit the second time works or the spit of the DTMF tone can cause it to jump to the next selection in an ivr and with the second DTMF tone selection which you did not request. they sometimes break up the DTMF tone and sometimes duplicate a single digit tone into two. DTMF tone issue have improved dramatically over the years and rarely seen as a problem except under certain conditions:ġ) If related to inbound calls to your Strategic Voice Solutions IVR/Auto Attendant, this may be tied to a Cellular Phone which are know to have jitter and delay problems due to the connection ro cell tower handoffs.
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