Source note · Wrong or missing caller ID on outbound calls

In Direct Routing, Microsoft's troubleshooting article says the From header holds the caller's number (or 'anonymous'), a substitute number from CsCallingLineIdentity, or the original caller's number on a forwarded call, while P-Asserted-Identity holds the number of the user billed for the call.

Checked 2026-09-25

Vendor: Microsoft
Product: Teams Phone Direct Routing
Subsystem: SIP identity headers
Deployment: multi-tenant
Region: not restricted
Release range: current as of 2026-09-25
Checked: 2026-09-25

Sources

Issues with outbound calls - Microsoft Teams — Microsoft · tier 2 current vendor documentation · Incorrect caller ID displayed to the recipient (intro paragraphs)

Cite this note

APA

WarmTransfer. (2026, September 25). Wrong or missing caller ID on outbound calls: source note caller-id-presentation-problems-teams-dr-header-contents. WarmTransfer. https://warmtransfer.net/knowledge/claims/caller-id-presentation-problems-teams-dr-header-contents

BibTeX

@misc{warmtransfer-claim-caller-id-presentation-problems-teams-dr-header-contents,
  title  = {Wrong or missing caller ID on outbound calls: source note caller-id-presentation-problems-teams-dr-header-contents},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/caller-id-presentation-problems-teams-dr-header-contents},
  note   = {Source note caller-id-presentation-problems-teams-dr-header-contents, checked 2026-09-25}
}

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