DRAG DROP
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Explanation/Reference:
Explanation:
54
Cisco 642-437 Exam
Cisco fax relay is the oldest method of supporting fax on Cisco IOS gateways and has been supportedsince Cisco IOS Release 11.3. Cisco fax relay uses Real-Time Transport Protocol (RTP) as the method oftransport. In Cisco fax relay mode, gateways terminate T.30 fax signaling by spoofing a virtual fax machineto the locally attached fax machine. The gateways use a Cisco- proprietary fax-relay RTP-based protocol tocommunicate between them. T.38 Fax Relay provides an ITU-T standards-based method and protocols forfax relay. Data is packetized and encapsulated according to the T.38 standard. The encoding of the packetheaders and the mechanism to switch from VoIP mode to fax relay mode are clearly defined in thespecification.
http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/voice_troubleshooting/old/vts_fax.html