Admin Guide - VoIP software provider

-as RFC2833SIP endpoints support the following DTMF send/receive methods-INFO method-as Tone (In-Band)-as RFC2833DTMF in GSM network (send/receive):-InBand DMTFThe SIP Softswitch (server) will parse DTMF received:-INFO method-as RFC2833-convert from the above modes to “in-band” dtmf if neededUsually In-Band DTMF are supported by any vendors in endpoint devices but will not be parsed on IVR servers because of high computationrequirements to decode the encoded RTP channels.The following DTMF global configuration settings are defined (key,default value, comment):‣ defdtmfpayload = 101; //default payload number can be also negotiated between the peers‣ maxdtmfdigit = 16; //max dtmf digit number (used in SDP)‣ ivrdtmfmethod = 4; //0=inband,1=info,2=inband+info,3=RFC2833,4=RFC2833 and info,5=inband, RFC2833 and info,6=inband,RFC2833 or info‣ dtmfdigittimeout = 6;‣ deftmfsleep = 500; //msec delay on space w or W chars‣ deftmfdelay = 0; //msec delay between 2 dtmf digit (default is 0. you might increase it usually not more than 1000 msec)‣ deftmfpackettime = 0; //0 means default value in msec (after the negotiated codec) usually between 10 and 60 msec‣ deftmfpacketcount = 6; //packets to send one dtmf digit‣ deftmfendpacketcount = 2; //packets to end one dtmf digit//the time spent for one dtmf digit is: (deftmfpacketcount + deftmfendpacketcount)*deftmfpackettime + deftmfdelay msec4.11.5. Call HoldThe call-hold feature is implemented according to SIP specification. Most UA will support it.