New-CsOnlinePSTNGateway (MicrosoftTeams)

Publisher

Microsoft Learn

URL

https://learn.microsoft.com/en-us/powershell/module/microsoftteams/new-csonlinepstngateway

Published

2025-08-01

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Microsoft Learn; CC BY 4.0 for documentation text per MicrosoftDocs repo, verify; no-redistribution; short excerpts and locators only

Source notes citing this source

• New-CsOnlinePSTNGateway creates the SBC disabled unless -Enabled $true is set; a disabled SBC continues existing calls while new calls go to another SBC in the route, if one exists. in context
• FailoverResponseCodes defaults to 408, 503 and 504; setting the parameter overwrites the defaults, so they must be re-listed if they are still wanted. in context
• FailoverTimeSeconds defaults to 10: outbound calls not answered by the gateway within that time are routed to the next available trunk, or dropped if there is none. in context
• MaxConcurrentSessions only drives alerting: when set, administrators are alerted at 90 percent or more of the value; when unset no alerts are generated, though concurrent sessions are still reported every 24 hours. in context
• The New-CsOnlinePSTNGateway reference says SipSignalingPort must be a value between 1 and 65535, and notes the parameter was renamed from SipSignallingPort. disputed in context
• By default Direct Routing tries another SBC in the user's voice routing policy when an outbound INVITE gets 408, 503 or 504; other 4xx and 6xx responses end the call unless FailoverResponseCodes is changed. in context
• In Teams Direct Routing, the MaxConcurrentSessions setting on an SBC (PSTN gateway) is used by the alerting system, which alerts the tenant administrator when concurrent sessions reach 90% or more of the configured value. in context
• The parameter reference describes MaxConcurrentSessions only as an alerting threshold and says nothing about calls being rejected above it, so it should not be treated as an enforced cap, even though the cmdlet summary calls it 'the limit of maximum concurrent sessions'. inferred in context
• If MaxConcurrentSessions is not set on a Direct Routing SBC, no concurrency alerts are generated, though the monitoring system still reports the number of concurrent sessions every 24 hours. in context

Cite this source record

APA

WarmTransfer. (2025, August 1). New-CsOnlinePSTNGateway (MicrosoftTeams). WarmTransfer. https://warmtransfer.net/knowledge/sources/ms-learn-new-csonlinepstngateway

BibTeX

@misc{warmtransfer-ms-learn-new-csonlinepstngateway,
  title  = {New-CsOnlinePSTNGateway (MicrosoftTeams)},
  author = {{WarmTransfer}},
  year   = {2025},
  url    = {https://warmtransfer.net/knowledge/sources/ms-learn-new-csonlinepstngateway},
  note   = {Microsoft Learn, accessed 2026-09-24}
}