Source note · Analysing a SIP call in Wireshark
Cisco's workaround for the duplicate c= line problem is a voice class SIP profile that removes the Audio-Connection-Info SDP header from REINVITE requests and 200 responses, applied globally or per dial-peer.
Checked 2026-09-24
- Vendor
- Cisco
- Product
- Cisco Unified Border Element
- Subsystem
- SIP profiles
- Deployment
- on-premises
- Region
- not restricted
- Release range
- as published 2013-04-26
- Checked
- 2026-09-24
Sources
- Duplicate c= Lines in SDP Cause Intermittent One-way Audio with Various ITSP(s) — Cisco Systems · tier 2 current vendor documentation · Duplicate c= Lines in SDP Cause Intermittent One-way Audio > Solution
Cite this note
APA
WarmTransfer. (2026, September 24). Analysing a SIP call in Wireshark: source note sip-call-analysis-wireshark-cube-dup-c-lines-fix. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-call-analysis-wireshark-cube-dup-c-lines-fix
BibTeX
@misc{warmtransfer-claim-sip-call-analysis-wireshark-cube-dup-c-lines-fix,
title = {Analysing a SIP call in Wireshark: source note sip-call-analysis-wireshark-cube-dup-c-lines-fix},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-call-analysis-wireshark-cube-dup-c-lines-fix},
note = {Source note sip-call-analysis-wireshark-cube-dup-c-lines-fix, checked 2026-09-24}
}