Cisco SPA1001 Administration Guide - Page 27

Where to Go From Here

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Chapter 1 Introducing Linksys Analog Telephone Adapters Where to Go From Here responds to a special NAT-Mapping-Discovery request by sending back a message to the source IP address/port of the request, where the message contains the source IP address/port of the original request. The Linksys ATA system can send this request when it first attempts to communicate with a SIP entity over the Internet. It then stores the mapping discovery results returned by the server. • Communicate the NAT mapping information to the external SIP entities. If the entity is a SIP Registrar, the information should be carried in the Contact header that overwrites the private address/port information. If the entity is another SIP UA when establishing a call, the information should be carried in the Contact header as well as in the SDP embedded in SIP message bodies. The VIA header in outbound SIP requests might also need to be substituted with the public address if the UAS relies on it to route back responses. • Extend the discovered NAT mappings by sending keep-alive packets. Because the mapping is alive only for a short period, the Linksys ATA system continues to send periodic keep-alive packets through the mapping to extend its validity as necessary. Where to Go From Here To Use the different administration and configuration tools provided for managing Linksys ATAs. Complete the basic configuration of a Linksys ATA. Configure the Linksys SPA3102 or AG310 for providing PSTN connectivity. Look up the function and usage for each field or parameter on the ATA administration web server pages. Look up the expansion of acronyms used in this document. Define the terms used in this document. Understand the operations of ATA user features. Refer to Chapter 2, "Getting Started" Chapter 3, "Configuring Linksys ATAs" Chapter 4, "Configuring the PSTN Gateway (FXO)" Chapter 5, "Linksys ATA Field Reference" Appendix A, "Acronyms" Appendix B, "Glossary" Appendix C, "User Guidelines" The following documentation provides additional information about features and functionality of Linksys ATAs: • AA Quick Guide • IVR Quick Guide • SPA Provisioning Guide The following documentation describes how to use and configure other Linksys VoIP products: • SPA9000 Administrator Guide • LVS CTI Integration Guide • LVS Integration with ITSP Hosted Voicemail Guide Document Version 3.1 Linksys ATA Administrator Guide 1-13

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1-13
Linksys ATA
Administrator Guide
Document Version 3.1
Chapter 1
Introducing Linksys Analog Telephone Adapters
Where to Go From Here
responds to a special NAT-Mapping-Discovery request by sending back a message to the source IP
address/port of the request, where the message contains the source IP address/port of the original
request. The
Linksys ATA
system can send this request when it first attempts to communicate with
a SIP entity over the Internet. It then stores the mapping discovery results returned by the server.
•
Communicate the NAT mapping information to the external SIP entities.
±
±
If the entity is a SIP Registrar, the information should be carried in the Contact header that
overwrites the private address/port information. If the entity is another SIP UA when establishing a
call, the information should be carried in the Contact header as well as in the SDP embedded in SIP
message bodies.
The VIA header in outbound SIP requests might also need to be substituted with
the public address if the UAS relies on it to route back responses.
•
Extend the discovered NAT mappings by sending keep-alive packets.
±
±
Because the mapping is alive only for a short period, the
Linksys ATA
system continues to send
periodic keep-alive packets through the mapping to extend its validity as necessary.
Where to Go From Here
The following documentation provides additional information about features and functionality of
Linksys ATAs:
•
AA Quick Guide
•
IVR Quick Guide
•
SPA Provisioning Guide
The following documentation describes how to use and configure other Linksys VoIP products:
•
SPA9000 Administrator Guide
•
LVS CTI Integration Guide
•
LVS Integration with ITSP Hosted Voicemail Guide
To
Refer to
Use the different administration and
configuration tools provided for managing
Linksys ATAs.
Chapter 2, “Getting Started”
Complete the basic configuration of a Linksys
ATA.
Chapter 3, “Configuring Linksys ATAs”
Configure the Linksys SPA3102 or AG310 for
providing PSTN connectivity.
Chapter 4, “Configuring the PSTN Gateway
(FXO)”
Look up the function and usage for each field or
parameter on the ATA administration web server
pages.
Chapter 5, “Linksys ATA Field Reference”
Look up the expansion of acronyms used in this
document.
Appendix A, “Acronyms”
Define the terms used in this document.
Appendix B, “Glossary”
Understand the operations of ATA user features.
Appendix C, “User Guidelines”