November 2014 archive

MGCP & SIP – DTMF Frenemies

[su_pullquote align=”right”]NTE-CA MGCP RTP-NTE has two implementations, which are Call Agent (CA) Controlled and Gateway (GW) Controlled. In CA-controlled mode, CA will negotiate DTMF relay capabilities on behalf of the gateways (SDP messages are sent  to CA). This is required in a setup where the other GW/Endpoint is  non-MGCP. After negotiation, CA instructs the MGCP …

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