Source note · CUCM CallManager SDL trace files

SIP Max Incoming Message Size defaulted to 5000 bytes in CUCM 8.6 and earlier and 11000 bytes from 9.x; clusters upgraded from 8.x or earlier keep 5000.

Checked 2026-09-22

Vendor: Cisco
Product: Unified Communications Manager
Subsystem: Cisco CallManager service parameters
Deployment: on-premises
Region: not restricted
Release range: 8.6 and earlier versus 9.x and later
Checked: 2026-09-22

Sources

Troubleshoot Most Common Issues for Business to Business Calls Through Expressway — Cisco Systems · tier 2 current vendor documentation · Error //SIP/SIPTcp/wait_SdlReadRsp: Ignoring large message > Solution

Cite this note

APA

WarmTransfer. (2026, September 22). CUCM CallManager SDL trace files: source note cucm-sdl-trace-files-sip-max-size-defaults. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-sdl-trace-files-sip-max-size-defaults

BibTeX

@misc{warmtransfer-claim-cucm-sdl-trace-files-sip-max-size-defaults,
  title  = {CUCM CallManager SDL trace files: source note cucm-sdl-trace-files-sip-max-size-defaults},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/cucm-sdl-trace-files-sip-max-size-defaults},
  note   = {Source note cucm-sdl-trace-files-sip-max-size-defaults, checked 2026-09-22}
}

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