Added check for createDTMFSender()
Added check for createDTMFSender()

fitraditya/samples,jan-ivar/samples,smbale/samples,virajs/samples,smadhusu/AppRTC,calebboyd/adapter,Acidburn0zzz/adapter,dengshaodong/docker-apprtc,Acidburn0zzz/adapter,shines/adapter,mvenkatesh431/apprtc,fippo/apprtc,harme199497/adapter,EmreAkkoyun/sample,todotobe1/apprtc,TribeMedia/apprtc,smayoorans/samples,YouthAndra/apprtc,ralic/samples,MahmoudFouad/samples,TribeMedia/samples,mvenkatesh431/samples,kod3r/samples,oliverhuangchao/samples,volkanh/volkanh.github.io,mulyoved/samples,tsruban/samples,82488059/apprtc,shelsonjava/apprtc,xdumaine/samples,leehz/samples,aadebuger/docker-apprtc,samdutton/apprtc,akashrchoksi/newone,mauricionr/samples,fitraditya/samples,juberti/samples,b-cuts/samples,virajs/samples,jiayliu/apprtc,martin7890/samples,Edward-Shawn/samples,procandi/apprtc,bpyoung92/apprtc,4lejandrito/adapter,myself659/samples,todotobe1/samples,virajs/apprtc,jarl-alejandro/apprtc,calebboyd/adapter,procandi/samples,webrtc/apprtc,aadebuger/docker-apprtc,TribeMedia/testrtc,jiayliu/apprtc,webrtc/apprtc,MahmoudFouad/samples,todotobe1/apprtc,webrtc/apprtc,bpyoung92/apprtc,samdutton/apprtc,Roarz/samples,kod3r/samples,bpyoung92/apprtc,todotobe1/samples,mvenkatesh431/samples,webrtc/samples,Edward-Shawn/samples,pquochoang/samples,oliverhuangchao/samples,volkanh/volkanh.github.io,xdumaine/samples,leehz/samples,smbale/samples,kod3r/samples,xdumaine/adapter,todotobe1/samples,smayoorans/samples,askdaddy/samples,webrtc/testrtc,virajs/testrtc,mulyoved/samples,akashrchoksi/newone,dajise/samples,TribeMedia/apprtc,todotobe1/apprtc,shelsonjava/apprtc,mvenkatesh431/apprtc,jiayliu/apprtc,bemasc/samples,bpyoung92/apprtc,fippo/apprtc,TribeMedia/testrtc,virajs/testrtc,pquochoang/samples,Acidburn0zzz/adapter,arnauorriols/apprtc,aadebuger/docker-apprtc,mvenkatesh431/apprtc,virajs/testrtc,JiYou/apprtc,YouthAndra/apprtc,JiYou/apprtc,webrtc/apprtc,82488059/apprtc,jjrasche/cell-based-RC-control,shelsonjava/samples,ralic/testrtc,Zauberstuhl/adapter,overtakermtg/samples,webrtc/adapter,samdutton/webrtc,askdaddy/samples,bemasc/samples,shelsonjava/testrtc,dengshaodong/docker-apprtc,mvenkatesh431/apprtc,knightsofaa/webrtc,todotobe1/apprtc,jessetane/testrtc,bbandaru/samples,TribeMedia/apprtc,Zauberstuhl/adapter,mvenkatesh431/apprtc,fippo/apprtc,samdutton/apprtc,ralic/samples,harme199497/adapter,todotobe1/apprtc,shelsonjava/apprtc,shelsonjava/samples,b-cuts/samples,shelsonjava/apprtc,bpyoung92/apprtc,guoweis/webrtc,fetterov/samples,virajs/samples,Edward-Shawn/samples,jiayliu/apprtc,fippo/webrtc,shines/adapter,akashrchoksi/newone,virajs/apprtc,webrtc/apprtc,guoweis/webrtc,pquochoang/samples,shelsonjava/testrtc,arnauorriols/apprtc,jessetane/testrtc,jjrasche/cell-based-RC-control,aadebuger/docker-apprtc,arnauorriols/apprtc,TribeMedia/apprtc,EmreAkkoyun/sample,fitraditya/samples,4lejandrito/adapter,JiYou/apprtc,juberti/samples,procandi/samples,dengshaodong/docker-apprtc,TribeMedia/apprtc,jan-ivar/adapter,procandi/apprtc,Temasys/Google-WebRTC-Samples,myself659/samples,TheKnarf/apprtc,dengshaodong/docker-apprtc,martin7890/samples,jan-ivar/adapter,TribeMedia/testrtc,martin7890/samples,TribeMedia/testrtc,jessetane/testrtc,jjrasche/cell-based-RC-control,TribeMedia/samples,mauricionr/samples,82488059/apprtc,jan-ivar/samples,procandi/apprtc,tsruban/samples,myself659/samples,diddie06/webrtc,JiYou/apprtc,jarl-alejandro/apprtc,fippo/apprtc,jarl-alejandro/apprtc,samdutton/webrtc,TheKnarf/apprtc,dengshaodong/docker-apprtc,jarl-alejandro/apprtc,YouthAndra/apprtc,shelsonjava/apprtc,ralic/samples,webrtc/adapter,knightsofaa/webrtc,ralic/testrtc,virajs/apprtc,fetterov/samples,webrtc/testrtc,fetterov/samples,TribeMedia/samples,bbandaru/samples,dajise/samples,shaohung001/samples,xdumaine/adapter,ralic/testrtc,smbale/samples,MahmoudFouad/samples,overtakermtg/samples,sarandogou/webrtc,aadebuger/docker-apprtc,procandi/apprtc,mauricionr/samples,rajsek/webrtc,jarl-alejandro/apprtc,keshwans/samples,dajise/samples,shines/adapter,fippo/apprtc,harme199497/adapter,shelsonjava/testrtc,smadhusu/AppRTC,xdumaine/samples,overtakermtg/samples,oliverhuangchao/samples,mvenkatesh431/samples,webrtc/samples,YouthAndra/apprtc,4lejandrito/adapter,dushmis/webrtc,samdutton/apprtc,jiayliu/apprtc,Zauberstuhl/adapter,taylor-b/samples,smadhusu/AppRTC,guoweis/webrtc,arnauorriols/apprtc,JiYou/apprtc,shelsonjava/testrtc,jessetane/testrtc,diddie06/webrtc,arnauorriols/apprtc,b-cuts/samples,keshwans/samples,procandi/apprtc,kosmosby/Google-WebRTC-Samples,calebboyd/adapter,virajs/apprtc,samdutton/apprtc,Roarz/samples,procandi/samples,Roarz/samples,ralic/testrtc,TheKnarf/apprtc,leehz/samples,taylor-b/samples,82488059/apprtc,shaohung001/samples,volkanh/volkanh.github.io,YouthAndra/apprtc,bbandaru/samples,smadhusu/AppRTC,fippo/webrtc,TheKnarf/apprtc,smayoorans/samples,tsruban/samples,82488059/apprtc,dushmis/webrtc,jjrasche/cell-based-RC-control,mulyoved/samples,Temasys/Google-WebRTC-Samples,shelsonjava/samples,virajs/testrtc,bemasc/samples,EmreAkkoyun/sample,TheKnarf/apprtc,smadhusu/AppRTC,virajs/apprtc