Sending DTMF tones in between outgoing call create call in 3 way mode in android -


when outgoing call event fire, after sometime call sending dtmf tones, when dtmf tones send, previous call going hold , new call generated, , generate 3 way calling in android.
can call not generate 3 way code?

code of sending dtmf is:

tonegenerator tone = new tonegenerator(audiomanager.stream_dtmf,tonegenerator.max_volume >> 1); tone.starttone(tonegenerator.tone_dtmf_1); tone.starttone(tonegenerator.tone_dtmf_2); tone.starttone(tonegenerator.tone_dtmf_3); tone.starttone(tonegenerator.tone_dtmf_4); tone.starttone(tonegenerator.tone_dtmf_5); tone.starttone(tonegenerator.tone_dtmf_6); tone.starttone(tonegenerator.tone_dtmf_7); tone.starttone(tonegenerator.tone_dtmf_8); tone.starttone(tonegenerator.tone_dtmf_9); tone.starttone(tonegenerator.tone_dtmf_p); tone.starttone(tonegenerator.tone_dtmf_s);  tone.stoptone();  concatenate_tonevalue = ("tel://");  (i = 0; < j; i++) {          value = string.valueof(param.charat(i));          try {             parsetonevalue = integer.parseint(value);         } catch (exception e) {             // todo: handle exception         }          tonea = tonegenerator.tone_dtmf_0;         toneb = tonegenerator.tone_dtmf_1;         tonec = tonegenerator.tone_dtmf_2;         toned = tonegenerator.tone_dtmf_3;         tonee = tonegenerator.tone_dtmf_4;         tonef = tonegenerator.tone_dtmf_5;         toneg = tonegenerator.tone_dtmf_6;         toneh = tonegenerator.tone_dtmf_7;         tonei = tonegenerator.tone_dtmf_8;         tonej = tonegenerator.tone_dtmf_9;         tonek = tonegenerator.tone_dtmf_p;         tonel = tonegenerator.tone_dtmf_s;          /* compare dialed value tone generator value */          if (parsetonevalue == tonea) {              concatenate_tonevalue += string.valueof(tonea) + ",";          } else if (parsetonevalue == toneb) {              concatenate_tonevalue += string.valueof(toneb) + ",";          } else if (parsetonevalue == tonec) {              concatenate_tonevalue += string.valueof(tonec) + ",";          } else if (parsetonevalue == toned) {              concatenate_tonevalue += string.valueof(toned) + ",";          } else if (parsetonevalue == tonee) {              concatenate_tonevalue += string.valueof(tonee) + ",";          } else if (parsetonevalue == tonef) {              concatenate_tonevalue += string.valueof(tonef) + ",";          } else if (parsetonevalue == toneg) {              concatenate_tonevalue += string.valueof(toneg) + ",";          } else if (parsetonevalue == toneh) {              concatenate_tonevalue += string.valueof(toneh) + ",";          } else if (parsetonevalue == tonei) {              concatenate_tonevalue += string.valueof(tonei) + ",";          } else if (parsetonevalue == tonej) {              concatenate_tonevalue += string.valueof(tonej) + ",";          } else if (parsetonevalue == tonek) {              concatenate_tonevalue += string.valueof(tonek) + ",";          } else if (parsetonevalue == tonel) {              concatenate_tonevalue += string.valueof(tonel) + ",";          }     }      uri uri = uri.parse(concatenate_tonevalue + tonegenerator.tone_dtmf_p);      myactivity activity = new myactivity();     activity.finish();       intent = new intent(intent.action_call, uri);             startactivity(i);      return false; }


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