Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure SIP Normalization and Transparency

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_b_feature-configuration-guide-for-cisco1251su3_chapter_01000011.html

Published

2026-09-16

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

Cisco copyright; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• The preinstalled cisco-meeting-server-interop script provides interoperability between Unified CM and Cisco Meeting Server. in context
• Custom scripts are created in Cisco Unified CM Administration under Device > Device Settings > SIP Normalization Script > Add New, either by typing into the Contents box or by using Import File. in context
• Preinstalled scripts cannot be edited, but they can be assigned to SIP trunks and SIP profiles. in context
• Cisco lists as a prerequisite that anyone developing custom scripts should review the Developer Guide for SIP Normalization and Transparency, and should first check whether a default script already meets the need. in context
• The preinstalled diversion-counter script provides a way to adjust the diversion counter. in context
• Checking Enable Trace on the trunk or SIP profile makes the script produce SDI traces, and Cisco recommends enabling tracing while debugging scripts. in context
• In Unified CM, SIP normalization and transparency is an optional feature for resolving SIP interoperability issues with endpoints, service providers, PBXs or gateways that implement SIP differently. in context
• The preinstalled HCS-PCV-PAI passthrough script supports integration of the Cisco HCS platform with an Enterprise IMS. in context
• The feature is configured by applying a Lua script to a SIP trunk or a SIP line, and Unified CM then runs the script against the SIP messages passing through that trunk or line. in context
• Memory use by a SIP normalization script is counted per trunk, not per script. in context
• The Release 15 guide states that normalization scripts apply regardless of the protocol of the endpoint on the other side of the SIP trunk. in context
• Normalization scripts modify incoming and outgoing SIP messages to resolve interoperability differences. in context
• The Release 15 guide lists eight preinstalled scripts: cisco-meeting-server-interop, cisco-telepresence-conductor-interop, cisco-telepresence-mcu-ts-direct-interop, diversion-counter, HCS-PCV-PAI passthrough, redsky-alternate-id-interop, refer-passthrough and vcs-interop. in context
• The preinstalled redsky-alternate-id-interop script adds RedSky headers to outbound INVITEs. in context
• The preinstalled refer-passthrough script removes Unified CM from a call after a blind transfer between SIP trunks. in context
• REFER transparency lets Unified CM pass a REFER request to the other call leg without acting on it itself; Cisco gives a call-center example in which a centralized agent transfers a caller to a geographically local agent. in context
• For SIP devices, the script is chosen in the SIP Profile (Device > Device Settings > SIP Profile), where an SDP Transparency Profile can also be selected in the SDP Information area. in context
• The task flow has three steps in this order: optionally create custom scripts, apply a script to a SIP trunk, and apply a script to SIP devices through the SIP profile. in context
• Transparency scripts let Unified CM pass SIP information such as proprietary headers from one call leg to the other. in context
• The Release 15 guide scopes transparency to calls where both call legs are SIP. in context
• A script is applied to a trunk under Device > Trunk by choosing it from the Normalization Script drop-down; Parameter Name and Parameter Value pairs are optional. in context
• The preinstalled vcs-interop script provides interoperability for endpoints registered to Cisco TelePresence Video Communications Server. in context

Cite this source record

APA

WarmTransfer. (2026, September 16). Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure SIP Normalization and Transparency. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cucm-fcg-15-sip-normalization

BibTeX

@misc{warmtransfer-cisco-cucm-fcg-15-sip-normalization,
  title  = {Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure SIP Normalization and Transparency},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cucm-fcg-15-sip-normalization},
  note   = {Cisco Systems, accessed 2026-09-25}
}