![]() ![]() How can there be efficient and effective progress on the issue? This document describes an important and useful troubleshooting method, known as loopback testing, and covers various loopback testing techniques. The Cisco Technical Assistance Center (TAC) does not directly deal with third party organizations.The problem could be mismatched configuration across the telco interface, which leads to clock slips, line/path violations, a damaged cable, a bad card, or telco issues. Multiple components impact the status of the ISDN Primary Rate Interface (PRI) or T1 CAS circuit.Faulty components might reside in several places - for example, within the Cisco domain or in a third-party (telco) domain.A common issue in VoIP networks with a digital interface connection to a telecommunications provider (telco) is that the ISDN or channel associated signaling (CAS) circuit does not come up or stay up. ![]()
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