# Glossary: SAP

The Service Access Point is used to bind the [SIP](/appendices/appendix-a-glossary/glossary-sip.md) stack with a transport server. Depending on the system configuration, multiple SAPS can be configured.

For example, signaling traffic to a proxy server can be transported over UDP, while another service can be transported over TCP. A distinct transport server (IP endpoint) is configured for each of these applications. In turn service access points are associated with one or more transport servers so that they can be easily and flexibly assigned to [network access points](/appendices/appendix-a-glossary/glossary-nap.md) (NAP).

The NAP allows for service access points (SAPs), [ISDN](/hidden-pages/glossary-isdn.md) stacks, and SS7 ISUP interfaces to be associated as a combined resource for one type of access. A NAP is used to represent a collection of voice endpoints, for example: a group of SS7 CICs, ISDN controlled timeslots, [SIP](/appendices/appendix-a-glossary/glossary-sip.md) outgoing proxy to a specific provider, and more. SAPs are, later in the configuration process, used to define how calls are routed out of the Tmedia system.

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