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P-Access-Network-Info
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This extension was introduced through the 3GPP, primarily for use within 3GPP (IMS) networks. The header provides additional information about the access technology that was used for accessing the network. For example, for a wireless subscriber using packet services, the header may look like:
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INVITE sip:travis.russell@tcg.com SIP/2.0 Via: SIP/2.0/UDP homepc101@aol.com;branch=z9hG4bK2bndnvk To: sip:deby.russell@aol.com From: sip:russell@tcg.com;tag=346249 Call-ID: 2Q3817637684230998sdasdh10 CSeq: 1826 INVITE Contact: <sip:russell@192.1.2.3> P-Access-Network-Info: access-type= IEEE-802.11b
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How this information gets used by the UAS is up to the service provider. One example might be providing specific services to the subscriber based on the type of access. If the subscriber is using a low-speed access link, for example, that subscriber may be restricted from using services that require higher-speed connections. This can also be used for billing applications where the billing is dependent on the access type. If the subscriber uses an 802.11 network to access the service provider network, the 802.11 service may be provided through another operator, and there may be additional charges for using this access method. Since this can be sensitive information, it is desirable to encrypt the information or delete it prior to transmitting any messages outside of the trusted domains. This is also implementation specific, so different operators may use this data differently. Any proxies in the path of the message ignore the header, as this information is not used by intermediate proxies, but by proxies providing a service (such as the S-CSCF in the IMS). The intermediate proxies simply ignore the header and route the message forward; if the proxy is providing a service, however, then that proxy will interpret the header and delete it prior to forwarding to another network.
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P-Answer-State
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This extension was introduced to support push-to-talk applications in cellular networks. The way this would work in a SIP network could vary depending on the implementation. This header was introduced to provide a better experience for the subscriber using the application. The intent is to minimize delay in the delivery of voice from the originator to the destination. What is different about this service and standard voice calls is that the devices themselves often have the capability to auto-answer an incoming call. This application works much like a walkie-talkie (think Nextel) and therefore needs a faster mechanism. When using SIP, the destination device would have to return a 200 OK response prior to the voice being sent to the device. This would introduce a bit of a delay. To eliminate this delay, this extension was added. The extension is used by the application servers supporting the push-to-talk application itself. These servers are capable of receiving the voice packets in advance of the destination device s actually responding to the initial request. The voice packets are buffered until the device has responded. The servers supporting the destination devices will usually know if the device is configured to automatically answer an incoming push-to-talk call; therefore, when the servers receive an INVITE, the server will insert this header and forward the INVITE to the next hop. The header is inserted in the response back to the requestor, informing it that it is acceptable to send the voice packets prior to a final response. In this response the server includes this header indicating that it believes that the destination will be able to accept the invitation ( unconfirmed header value) and is configured for auto-answer. The server will then send this provisional response in the backward direction to notify the originator of the request that the message is being processed, and when the final push-to-talk server is reached, a 200 OK is returned by that server (where the buffering is to take place). The originator can then begin speaking, with the packetized voice routed to the pushto-talk server. The server then buffers this packetized voice until the 200 OK response is received from the destination device, at which point the voice is forwarded directly to the device. The server buffering the voice does not forward the 200 OK response, as it has already sent this response to the UAC originating the session. However, any servers in between the destination and the buffering server will see this 200 OK response with the P-ANSWER-STATE header having the value of confirmed. There are provisions that allow the implementation of multiple servers supporting push-to-talk, with the server closest to the called party performing the buffering of the packetized voice. This is the server that is most likely to understand the configuration of the destination device, and whether or not it is capable of auto-answer (in which case it will automatically send a 200 OK response). The contributors of this extension believe that sending the voice packets prior to receiving the final answer from the called party will expedite the delivery of voice to the device and provide a more positive and real-time experience for the called and calling parties.
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