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![Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (SCCP) (2.15.ms, Rev B0) - SCCP Call Flows [Cisco ATA 180 Series Analog Telephone Adaptors] - Cisco](https://www.cisco.com/c/dam/en/us/td/i/000001-100000/80001-85000/82001-83000/82055.ps/_jcr_content/renditions/82055.jpg "Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (SCCP) (2.15.ms, Rev B0) - SCCP Call Flows [Cisco ATA 180 Series Analog Telephone Adaptors] - Cisco")