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Work item:
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Q.CSSIWF
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Subject/title:
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Certificate based secure signalling interworking function between voice over internet protocol networks and legacy public switched telephone networks/ integrated services digital networks
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Status:
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Under study
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Approval process:
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AAP
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Type of work item:
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Recommendation
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Version:
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New
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Equivalent number:
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-
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Timing:
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2027-12 (Medium priority)
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Liaison:
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ITU-T SG2, SG17, IETF, ATIS
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Supporting members:
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Vaulto Communication Technologies (Israel), SomosGov, Inc. (USA), USA
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Summary:
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This new draft Recommendation specifies procedures for Calling Line Identification (CLI) authentication in SIP/VoIP networks using IETF STIR (Secure Telephone Identity Revisited) mechanisms, integrated into the ITU-T Q-series trust framework defined in Recommendations ITU-T Q.3057, Q.3062, Q.3063, and Q.TSCA.
It specifies how PASSporT objects, SIP Identity headers, and STIR certificate chains are used within a Trusted Signalling Certification Authority (TSCA) trust model to support cross-jurisdiction validation of telephone number identity in SIP-based signalling environments.
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Comment:
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-
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Reference(s):
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Historic references:
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Contact(s):
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| ITU-T A.5 justification(s): |
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First registration in the WP:
2026-03-18 18:13:27
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Last update:
2026-03-18 18:18:47
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