Phones drops calls and ringing thru issues on UC520

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Jun 22nd, 2008
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I have a UC520 with six(6) PSTN lines in rotary connected to FXO cards. I am having an issue with calls being dropped, ringing and no one on the line and transfer problems. All six (6) numbers appear on all four (4) 7931 phones. Can anyone tell me why this may be happening?

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paolo bevilacqua Mon, 06/23/2008 - 00:37
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Which exact IOS are you using (complete output of "show version") ?

phillip-wright Mon, 06/23/2008 - 03:11
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Cisco IOS Software, UC500 Software (UC500-ADVIPSERVICESK9-M), Version 12.4(11)XW4, RELEASE SOFTWARE (fc3)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2007 by Cisco Systems, Inc.

Compiled Thu 27-Sep-07 19:25 by prod_rel_team


ROM: System Bootstrap, Version 12.4(11r)XW, RELEASE SOFTWARE (fc1)


Tony_Liker uptime is 11 weeks, 1 day, 7 hours, 1 minute

System returned to ROM by power-on

System restarted at 14:50:03 GMT Tue Mar 18 2008

System image file is "flash:uc500-advipservicesk9-mz.124-11.XW4"



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Cisco UC520-8U-4FXO-K9 (MPC8358) processor (revision 0x202) with 249856K/12288K bytes of memory.

Processor board ID FTX1144Y184

MPC8358 CPU Rev: Part Number 0x804A, Revision ID 0x20

10 FastEthernet interfaces

2 terminal lines

6 Voice FXO interfaces

4 Voice FXS interfaces

1 Voice MoH interface

1 cisco service engine(s)

128K bytes of non-volatile configuration memory.

125440K bytes of ATA CompactFlash (Read/Write)


Configuration register is 0x2102

paolo bevilacqua Mon, 06/23/2008 - 03:13
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Hi, can you please upgrade to 2.4(11)XW8, the one you're using has many many bugs.


Hope this helps, please rate post if it does!

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