Configuring the PSTN (FXO) Gateway on the SPA3102

6

 

How VoIP-To-PSTN Calls Work

 

 

 

 

 

If the FXO port is currently in use (off-hook) or the PSTN line is being used by another extension, the ATA device replies to the INVITE with a 503 response. Otherwise, it compares the <Dialed-Number> with the User ID parameter of the PSTN Line. If they are the same, the ATA device interprets this as a request for two-stage dialing (see the ”Two-Stage Dialing” section on page 97). If they are different, the ATA device processes the <Dialed-Number> using the corresponding <Dial Plan>.

If dial plan processing fails, the ATA device replies with a 403 response. Otherwise, it replies with a 200 and at the same time takes the FXO port off hook and dials the target number returned after processing the dial plan.

NOTE If the User ID parameter on the PSTN Line is blank, the Register parameter should be disabled for the PSTN Line.

If HTTP Digest Authentication is enabled, the ATA device challenges the INVITE with a 401 response if it does not have a valid Authorization header. The Authorization header should include a <User ID n> parameter, where n refers to one of eight VoIP user accounts that can be configured on the ATA device. The credentials are computed based on the corresponding password using Message Digest 5 (MD5). The <User ID n> parameter must match one of the VoIP accounts stored on the ATA device. Each VoIP user account contains the information listed below.

Table 1 Authentication Parameters

Parameter

Web

Description

Values

 

Page

 

 

 

 

 

 

User ID 1/2/

PSTN

The username value.

31-character string

3/4/5/6/7/8

Line

 

 

 

 

 

 

Password 1/

PSTN

The password value.

31-character string

2/3/4/5/6/7/

Line

 

 

8

 

 

 

 

 

 

 

User 1/2/3/

PSTN

Specifies the dial plan to be used for

Choice of 0-8

4/5/6/7/8

Line

this VoIP user. If 0, dial plan

 

DP

 

processing is disabled; the given

 

 

 

target number is dialed to the PSTN

 

 

 

as is.

 

 

 

 

 

ATA Administration Guide

96

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Cisco Systems SPA8000, SPA2102, SPA3102, WRP400, PAP2T manual Authentication Parameters Web Description Values
Page 97 Page 99

PAP2T, SPA8000, SPA3102, WRP400, SPA2102 specifications

The Cisco Systems SPA2102 is a versatile Voice over Internet Protocol (VoIP) adapter that serves as a bridge between traditional telephony systems and modern IP networks. Designed primarily for small to medium businesses, the SPA2102 is highly regarded for its reliability, ease of use, and rich feature set. This device allows users to make and receive phone calls over the internet while maintaining the ability to connect traditional analog phones.

One of the standout features of the SPA2102 is its dual-port capability. The device includes two FXS ports, allowing users to connect two separate analog telephones. This makes it an ideal choice for businesses that want to retain their existing telephony infrastructure while transitioning to a VoIP system. The ability to utilize two telephone lines simultaneously provides flexibility and convenience, especially for users in a busy office environment.

The SPA2102 leverages Session Initiation Protocol (SIP) technology, which is widely recognized for its robustness and interoperability. The support for SIP ensures that the SPA2102 can work seamlessly with various VoIP service providers, offering users a broad range of options for their telecommunication needs. In addition to SIP, the device supports various codecs, including G.711, G.726, and G.729, allowing for flexible audio quality settings and bandwidth management.

Security is also a critical aspect of the SPA2102. It incorporates advanced encryption methods, such as Secure Real-time Transport Protocol (SRTP) and Transport Layer Security (TLS), to protect voice communications from potential eavesdropping. This focus on security makes the SPA2102 a reliable choice for businesses concerned about the confidentiality of their conversations.

The device is easy to configure and manage, thanks to its web-based interface. This allows administrators to quickly set up the adapter, manage network settings, and troubleshoot any issues that may arise. Furthermore, the SPA2102 supports Quality of Service (QoS) features, ensuring that voice traffic is prioritized over other types of network traffic, which enhances call quality and reliability.

Overall, the Cisco SPA2102 is a powerful, user-friendly VoIP adapter that combines traditional telephony with modern IP technology. Its dual-port capability, support for SIP, extensive security features, and ease of configuration make it a solid choice for businesses looking to innovate their communication systems while minimizing disruption. Whether used in a small office or a larger organizational setting, the SPA2102 continues to be a reliable component of VoIP solutions.
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