> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/telecom-references/protocols/m2ua-satellite-settings.md). # M2UA Satellite Settings #### ***Applies to version(s): v2.9 and above*** Connections through satellite produce unusual delays in a communication path. To decrease the chance of a link going down because of delays, we can adjust timer settings for M2UA sigtran connection. **Default values** **SCTP configuration modification** * Adv->Life time of MD5 keys = 5 seconds **M2UA configuration modification** * Timers->SCTP Poll Timer = 1 seconds * Timers->AS Pending Timer = 1 seconds * Timers->Congestion polling timer = 1 seconds * Timers->Ack Timer = 1 seconds **M2UA SAP configuration modification** * SCTP Primitive Timer = 1 seconds * SCTP SAP->Maximum ACK delay = 0.1 seconds * SCTP SAP->Initial RTO = 1.5 seconds * SCTP SAP->Minimum RTO = 100 milliseconds * SCTP SAP->Maximum RTO = 2 seconds * SCTP SAP->Freeze timer = 1.5 seconds * SCTP SAP->Cookie life time = 30 seconds * SCTP SAP->Delay between heartbeat = 1.5 seconds **To support 600ms to 1.5 seconds delay, we recommend these timer values for M2UA** **SCTP configuration modification** * Adv->Life time of MD5 keys = 60 seconds **M2UA configuration modification** * Timers->SCTP Poll Timer = 3 seconds * Timers->AS Pending Timer = 3 seconds * Timers->Congestion polling timer = 3 seconds * Timers->Ack Timer = 3 seconds **M2UA SAP configuration modification** * SCTP Primitive Timer = 3 seconds * SCTP SAP->Maximum ACK delay = 3 seconds * SCTP SAP->Initial RTO = 1 seconds * SCTP SAP->Minimum RTO = 600 milliseconds * SCTP SAP->Maximum RTO = 10 seconds * SCTP SAP->Freeze timer = 15 seconds * SCTP SAP->Cookie life time = 60 seconds * SCTP SAP->Delay between heartbeat = 5 seconds **To support 7.5 seconds delay, we tested these timer values for M2UA** **SCTP configuration modification** * Adv->Life time of MD5 keys = 60 seconds **M2UA configuration modification** * Timers->SCTP Poll Timer = 12 seconds * Timers->AS Pending Timer = 12 seconds * Timers->Congestion polling timer = 12 seconds * Timers->Ack Timer = 12 seconds **M2UA SAP configuration modification** * SCTP Primitive Timer = 12 seconds * SCTP SAP->Maximum ACK delay = 10 seconds * SCTP SAP->Initial RTO = 5 seconds * SCTP SAP->Minimum RTO = 3 seconds * SCTP SAP->Maximum RTO = 20 seconds * SCTP SAP->Freeze timer = 15 seconds * SCTP SAP->Cookie life time = 60 seconds * SCTP SAP->Delay between heartbeat = 6 seconds --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://prosbcdocs.telcobridges.com/telecom-references/protocols/m2ua-satellite-settings.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.