Appendix D SCCP Call Flows

Call Flow Scenarios for Successful Calls

Table D-1 Action Descriptions for First Call Flow

Step

Action

Description

 

 

 

Step 1

StationRegister—Cisco ATA to Cisco CallManager

Cisco ATA sends a message to announce its existence to the

 

 

Cisco CallManager.

 

 

 

Step 2

StationReset—Cisco CallManager to Cisco ATA

The Cisco CallManager commands the Cisco ATA to reset its

 

 

processes.

 

 

 

Step 3

StationIpPort—Cisco ATA to Cisco CallManager

The Cisco ATA provides Cisco CallManager with the UDP

 

 

port for the RTP stream.

 

 

 

Step 4

StationRegisterAck—Cisco CallManager to Cisco

Cisco CallManager acknowledges the registration of the

 

ATA

Cisco ATA.

 

 

 

Step 5

StationCapabilitiesReq—Cisco CallManager to

Cisco CallManager requests the current capabilities of the

 

Cisco ATA

Cisco ATA.

 

 

 

Step 6

StationVersionReq—Cisco ATA to

Cisco ATA requests the version number of the software.

 

Cisco CallManager

 

 

 

 

Step 7

StationCapabilitiesRes—Cisco ATA to

Cisco ATA responds to the Station Capabilities Request

 

Cisco CallManager

message from the Cisco CallManager. These capabilities are

 

 

cached in the Cisco CallManager and are used to negotiate

 

 

terminal capabilities with an H.323-compliant terminal.

 

 

 

Step 8

StationVersionRes—Cisco CallManager to

Cisco CallManager informs the Cisco ATA of the current

 

Cisco ATA

software version number.

 

 

 

Step 9

StationButtonTemplateReq—Cisco ATA to

Cisco ATA requests the button template definition for that

 

Cisco CallManager

specific Cisco ATA.

 

 

 

Step 10

StationButtonTemplateRes—Cisco CallManager to

Cisco CallManager updates the button template information

 

Cisco ATA

contained in the Cisco CallManager.

 

 

 

Step 11

StationTimeDateReq—Cisco ATA to

Cisco ATA requests the current date and time for internal

 

Cisco CallManager

usage and for displaying a text string.

 

 

 

Step 12

StationDefineTimeDate—Cisco CallManager to

Cisco CallManager provides the date and time information to

 

Cisco ATA

the Cisco ATA.

 

 

 

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SCCP)

 

D-4

OL-3141-01

 

 

 

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Cisco Systems ATA 186, ATA 188 manual Step Action Description, Ata
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ATA 188, ATA 186 specifications

The Cisco Systems ATA 186, or Analog Telephone Adapter, revolutionized the way traditional telephony interacted with Voice over Internet Protocol (VoIP) systems. Designed primarily for home and small office use, the ATA 186 allows users to connect standard analog phones and fax machines to a network, enabling them to take advantage of the benefits of VoIP technology.

One of the defining features of the ATA 186 is its dual port architecture. It includes two FXS ports, allowing users to connect up to two analog telephones. This functionality means that multiple devices can leverage VoIP services simultaneously without the need for separate adapters for each phone. The flexibility of the ATA 186 helps streamline the user experience, facilitating voice communication over an IP network while ensuring users can still use their existing phone equipment.

The ATA 186 employs various technologies to maintain high-quality voice calls. It supports standard voice codecs such as G.711 and G.729, which ensure efficient bandwidth usage while preserving call clarity. The adaptive jitter buffer technology further enhances call quality, compensating for network variations and minimizing latency, which is crucial for clear and uninterrupted conversations.

Additionally, the ATA 186 provides users with advanced calling features that were traditionally available only on PBX systems. These features include caller ID, call waiting, and voicemail functionality, integrating seamlessly with typical telephony services. The device also supports T.38 fax relay, allowing users to send and receive faxes over the internet, thus addressing the needs of environments where fax communication remains essential.

The security of VoIP conversations is also a priority for the ATA 186. It employs encryption protocols such as Secure Real-time Transport Protocol (SRTP) and Transport Layer Security (TLS), ensuring that voice data is securely transmitted across the network. This focus on security helps protect sensitive information transmitted during calls.

Installation and configuration of the ATA 186 is streamlined, with an intuitive web-based interface that simplifies the setup process. This accessibility makes it suitable for users with varying levels of technical expertise, as frequently required adjustments, such as network configurations and firmware updates, can be easily managed.

In conclusion, the Cisco Systems ATA 186 stands out as a versatile and robust solution for users looking to integrate analog phones into a VoIP environment. With its dual port capabilities, high-quality voice codecs, advanced call features, and security measures, it offers a compelling choice for both residential and commercial users seeking seamless telephony integration. As technology evolves, devices like the ATA 186 remain cornerstones in bridging traditional telephony with modern communication systems.
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