Chapter 3 Configuring the Cisco ATA for MGCP

Specifying a Preconfigured VLAN ID or Disabling VLAN IP Encapsulation

Table 3-1 Parameters and Bits for Preconfiguring a VLAN ID

Parameter and Bits

Reference

OpFlags:

OpFlags, page 5-27

• Bit 4—Enable the use of user-specified voice VLAN ID.

 

• Bit 5—Disable VLAN encapsulation

 

• Bit 6—Disable CDP discovery.

 

 

 

VLANSetting:

VLAN Setting, page 5-11

•Bits 0-2—Specify VLAN CoS bit value (802.1P priority) for TCP packets.

•Bits 3-5—Specify VLAN CoS bit value (802.1P priority) for Voice IP packets

•Bits 18-29—User-specified 802.1Q VLAN ID

Table 3-2 VLAN-Related Features and Corresponding Configuration Parameters

 

 

 

 

VLANSetting

 

OpFlags Bit 4

OpFlags Bit 5

OpFlags Bit 6

Bits 18-29

Feature

 

 

 

 

 

 

 

 

 

Static VLAN

1

0

1

VLAN ID

 

 

 

 

 

CDP-acquired

0

0

0

N/A

VLAN

 

 

 

 

 

 

 

 

 

No VLAN

N/A

1

N/A

N/A

 

 

 

 

 

No CDP

N/A

N/A

1

N/A

 

 

 

 

 

No CDP and no

0

1

1

N/A

VLAN

 

 

 

 

 

 

 

 

 

N/A indicates that the variable is not applicable to the feature and the setting of this varaible does not affect the feature.

Example

The following procedure shows you how to configure the OpFlags and VLANSetting parameters to allow the Cisco ATA to use a user-specified VLAN ID. In this example, the voice VLAN ID is 115 (in decimal format).

Step 1 Set bits 4-6 of the OpFlags parameter to 1, 0, and 1, respectively. This setting translates to the following bitmap:

xxxx xxxx xxxx xxxx xxxx xxxx x101 xxxx

The remaining bits of the OpFlags parameter, using all default values, make up the following bitmap representation:

0000 0000 0000 0000 0000 0000 0xxx 0010

Therefore, the resulting value of the OpFlags parameter becomes the following bitmap representation:

0000 0000 0000 0000 0000 0000 0101 0010

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)

3-4

OL-4803-01

 

 

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Cisco Systems ATA 186 manual Parameter and Bits Reference, VLANSetting, Feature, Example
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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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