![]() 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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