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POLYCOM terminal call MCU in ISDN but can not set up connection

Publication Date:  2012-09-25 Views:  52 Downloads:  0
Issue Description
Terminal is POLYCOM, ISDN 128, MCU is 8620. The MCU can set up connection when it call terminal, but the terminal can not set up connection when it call MCU.
Alarm Information
The MCU local management console show the information: connection port is cleared
Handling Process
Change the calling mode from 64K*2 to 128K, then it become OK.
Root Cause
None
Suggestions
POLYCOM terminal usually use 64K*2 mode, if we need connect it to our device the mode should be changed to 128K.

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