Call Manager 4.x used MTP (Media Termination Point) media resources to convert out of band SIP Notify DTMF messages into RFC2833 in-band (RTP) messages. Java Telephony Application Protocol Interface ...
The problem is that RFC 3261 that defines SIP has become "everything to everyone" and bloated in both size and in flexibility. For those of you that have deployed SIP-based solutions or SIP Trunking, ...
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