Linksys PAP2

Hardware

The Linksys PAP2 is an analog telephony adapter (ATA), which allows for the connection of up to two analog telephones to a softswitch or VoIP carrier using Session Initiation Protocol (SIP). The physical connections on the device are two RJ11 jacks for the telephones and one 8P8C jack for ethernet. The ethernet connection is 10 Mbit/s, half-duplex. The device is configured through a web interface. Each analog telephone is presented as a distinct SIP user.

The Linksys PAP2 is based on the Sipura SPA-2000 ATA design. The device is designed around an ESS Visba 3 (ES3890F) chipset and Realtek RTL8019AS 10BaseT Ethernet controller.

The original PAP2 has been discontinued. The PAP2 version 2 and the PAP2T are successors with similar capabilities, the PAP2T is reported to have twice the memory of the PAP2 version 1. They are different enough that they have distinct firmware. The PAP2 version 2, unlike the others, runs Linux (Linksys has released source for the GPLed portions of the firmware). ^[1]

As of late 2011, Cisco has introduced the SPA112, which supersedes the PAP2T, and the SPA122, which replaces the SPA2102 (these latter two include router functionality.) ^{[2] [3]}

Hardware and revisions

Cisco Linksys PAP2

Version	RAM	Flash memory	FXS Ports	Notes
1.0	2 MB	1 MB	2	Power adapter is 5V DC 2.0A
2.0	16 MB	8 MB	2	Power adapter is 12V DC 1.0A. Runs Linux.
3.0	16 MB	8 MB	2	Power adapter is 12V DC 1.0A. Marketed as the PAP2T.

Bundled units

The PAP2 has been bundled with popular VoIP services such as Vonage and AT&T’s CallVantage offering. These may be locked to such VoIP services but an unlocked version of the device (which is directly comparable with the Sipura device), is also available. This is referred to as the PAP2-NA or PAP2T-NA or PAP2-EU.

Locked units usually have the second line inaccessible, unless the provider specifically configures it (for example if you had two Vonage lines).

Firmware modification

For a while, people were able to unlock the "locked" devices offered by providers such as Vonage, however since November 2005, a firmware update has been released which "corrects" some of loopholes being used to unlock the devices. In one particular instance, Vonage have actually withdrawn some of their PAP2's from UK retailers such as Comet in order to replace them with units containing the newer firmware, so that there is little chance of them being unlocked. As of 2007, all Vonage PAP2 devices can be unlocked. However, PAP2s, including PAP2-NAs locked to other providers generally cannot be unlocked without either that provider's encryption key or the administrator password.

Linksys datasheet

The Linksys Internet Phone Adapter provides telephone service through an Internet connection. It connects to the Internet gateway and provides two telephone jacks for telephones or fax machines. Each phone jack has independent phone service and phone numbers. The Linksys equipment provides other features and benefits associated with Internet telephony.

Minimum requirements

• High-speed Internet connection (cable/DSL/other)
• Broadband router or gateway
• Activated Voice over IP Service
• Regular analog touch-tone telephone

Supported codecs

• G.711 (u/a)
• G.723 (5.3/6.3)kbps
• G.726 (16/24/32/40)kbps
• G.729a (only one line at a time due to onboard CPU power)

References

1. ^ More information is at http://www.cisco.com/en/US/products/ps10024/products_qanda_item09186a0080a35d2c.shtml
2. ^ http://www.888voip.com/cisco-launches-new-spa112-and-spa122-atas/
3. ^ http://alarmmonitoring.wordpress.com/2011/11/15/cisco-spa112/

External links

• User Guide - User Guide from Cisco
• PAP2T support - Information about the PAP2
• linksys GPL source code
• Cisco SPA112 Specifications