Configuring the PSTN (FXO) Gateway on the SPA3102

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How VoIP-To-PSTN Calls Work

 

 

 

 

 

•VoIP user—VoIP caller that has a user account (user-id and password) on the ATA device

•PSTN caller—One who calls the ATA device from the PSTN to obtain VoIP service

Line 1 can be configured with a regular VoIP account and can be used in the same way as the Line 1 of any ATA device.

A second VoIP account can be configured to support PSTN gateway calls exclusively. A different SIP port should be assigned to Line 1 and the PSTN Line. The same VoIP account may be used for both Line 1 and the PSTN Line if a different SIP port is assigned to each.

VoIP callers can be authenticated by one of the following methods:

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No Authentication—All callers are accepted for service.

PIN—Caller is prompted to enter a PIN right after the call is answered.

HTTP digest—SIP INVITE must contain a valid authorization header.

PSTN callers can be authenticated by one of the following methods:

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No authentication—All callers are accepted for service.

PIN—Caller is prompted to enter a PIN right after the call is answered.

How VoIP-To-PSTN Calls Work

To obtain PSTN services through the SPA3102, the VoIP caller establishes a connection with the PSTN Line by way of a standard SIP INVITE request addressed to the PSTN Line. The PSTN Line can be configured to support one- stage and two-stage dialing as described in the following sections.

One-Stage Dialing

One-stage dialing allows a call to be started over VoIP and then immediately get a dial tone on the PSTN.

To use one-stage dialing, the Request-URI of the INVITE to the PSTN Line should have the form <Dialed-Number>@<SPA-Address>, where <Dialed-Number> is the number dialed by the VoIP caller, and <SPA-Address> is a valid address and port of the SPA3102, such as 10.0.0.100:5061.

ATA Administration Guide

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Cisco Systems WRP400 manual How VoIP-To-PSTN Calls Work, One-Stage Dialing, Configuring the Pstn FXO Gateway on the SPA3102
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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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