NSAPI, or Network (Layer) Service Access Point Identifier, is a system used utilised in UMTS and GPRS networks.

It is used to identify a Packet Data Protocol (PDP) context (a unique data session) in the Mobile Station (MS) and in the Serving GPRS Support Node (SGSN). It is dynamically selected by the MS (however, the MS should ensure that the selected NSAPI is not currently being used by another session management entity in the MS). When the MS requests a PDP context, it selects a NSAPI that it sends to the SGSN with the request.

NSAPI is also used as part of the Tunnel Identifier between GPRS Support Nodes (GSNs). The user identity (International Mobile Subscriber Identity (IMSI)) and the application identifier (NSAPI) are integrated into the Tunnel Identifier (GTPv0) (TID) or Tunnel Endpoint Identifier (GTPv1) (TEID) that uniquely identifies the subscriber’s sublink between the GSNs (SGSN and GGSN). The SGSN inserts the NSAPI along with the GGSN address in the "Activate PDP Context Request". One PDP context may have several (secondary) PDP contexts and NSAPI. The NSAPI is an integer value within the PDP context header.

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@tualatrix 虽说 @Fenng 前辈让支付保有 NSAPI 插件了，可是跟对方淘宝旺旺还是得 XP 呀。而那网页版旺旺没有聊天记录，没法用做法律证据
shellexy (Shellexy) Wed, 28 Oct 2009 08:28:57 -0000
@tualatrix 虽说 @Fenng 前辈让支付保有 NSAPI 插件了，可是跟对方淘宝旺旺还是得 XP 呀。而那网页版旺旺没有聊天记录，没法用做法律证据
@tualatrix 支付保 Linux 版是 NSAPI 插件（用于几乎所有非 IE 浏览器），不限于 FireFox 的
shellexy (Shellexy) Wed, 28 Oct 2009 08:27:39 -0000
@tualatrix 支付保 Linux 版是 NSAPI 插件（用于几乎所有非 IE 浏览器），不限于 FireFox 的

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