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CCOのドキュメントに以下の記載があります。
NIMs Support Multiple Voice Applications on the Cisco 4000 Series ISRshttps://www.cisco.com/c/en/us/products/collateral/routers/4000-series-integrated-services-routers-isr/datasheet-c78-733646.html
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Hi Donal,If the PBX is only connected with ISR4321 (via two E1s on thesame NIM), the PBX need to receive the clock from the line andsend E1 frame using the same clock.Would it be possible for you to check the PBX's configuration.(Is the PBX's line is...
Hi Donal,If you configure your ISR4321 to provide T1 clock (as clock master),PBX or Telco should be configured to receive T1 clock from ISR4321.Otherwise slip error will be observed on the T1 line.You will need to consult with PBX vendor on the clock...