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CME 2851 - Dropping calls on primary DN when shared line is answered


Problem Summary

Shared line 7004 members have a button called 'MAPS 5' assigned to button 2 on handsets.

For no apparent reason and after no identified changes to the CME (2851), when users (members of 7004 shared line) are on a call on their primary line, if a call comes in on the shared number (7004) and is answered, all calls on the users (shared line 7004 members) primary lines are cut off (dead silence).


I suspect there is a but in the software bug in IOS release 12.4(20)T4 which is the cause of this, but before I sugest to the client an upgrade I just wanted to get anybodys thoughts on the matter.

Has anyone had any experince with problems similar to this?

Below are exerts from the config and I have attached the full config as well.

Thank you.


ephone-dn  104  dual-line
number 7004
pickup-group 99
label MAPS 5
name MAPS 5
huntstop channel
no huntstop
hold-alert 60 originator
ephone-hunt 1 sequential
pilot 7051
list 7021, 7004
final 7009
timeout 25, 15
MNPR001#show ephone-hunt
Group 1
    type: sequential
    pilot number: 7051, peer-tag 20258; expanded-number 64367051, peer-tag 20259
    list of numbers:
        7021, aux-number A7051A0000, # peers 4, logout 0, down 0
            peer-tag  dn-tag  rna  login/logout  up/down
             [20257     134    0       login      up  ]
             [20256     133    0       login      up  ]
             [20255     132    0       login      up  ]
             [20254     131    0       login      up  ]
        7004, aux-number A7051A0001, # peers 1, logout 0, down 0
            peer-tag  dn-tag  rna  login/logout  up/down
             [20260     104    0       login      up  ]
    final number: 7009
    preference: 0
    preference (sec): 9
    timeout: 25, 15
    E.164 register: yes
    auto logout: no
    stat collect: no
    callqueue display: continuously
    debug: no

MNPR001#show dialplan number 7004
Macro Exp.: 7004

        peer type = voice, system default peer = FALSE, information type = voice,
        description = `',
        tag = 20193, destination-pattern = `7004$',
        voice reg type = 0, corresponding tag = 0,
        allow watch = FALSE
        answer-address = `', preference=0,
        CLID Restriction = None
        CLID Network Number = `'
        CLID Second Number sent
        CLID Override RDNIS = disabled,
        rtp-ssrc mux = system
        source carrier-id = `', target carrier-id = `',
        source trunk-group-label = `',  target trunk-group-label = `',
        numbering Type = `unknown'
        group = 20193, Admin state is up, Operation state is up,
        incoming called-number = `', connections/maximum = 0/unlimited,
        DTMF Relay = disabled,
        URI classes:
            Destination =
        huntstop = disabled,
        in bound application associated: 'DEFAULT'
        out bound application associated: ''
        dnis-map =
        permission :both
        incoming COR list:maximum capability
        outgoing COR list:minimum requirement
        Translation profile (Incoming):
        Translation profile (Outgoing):
        incoming call blocking:
        translation-profile = `'
        disconnect-cause = `no-service'
        advertise 0x40 capacity_update_timer 25 addrFamily 4 oldAddrFamily 4
        mailbox selection policy: none
        type = pots, prefix = `',
        forward-digits 0
        session-target = `', voice-port = `50/0/104',
        direct-inward-dial = disabled,
        digit_strip = enabled,
        register E.164 number with H323 GK and/or SIP Registrar = TRUE
        fax rate = system,   payload size =  20 bytes
        supported-language = ''
        preemption level = `routine'
            maximum = 64 KBits/sec, minimum = 64 KBits/sec
        voice class called-number:
            inbound = `', outbound = `'
        dial tone generation after remote onhook = enabled

        Time elapsed since last clearing of voice call statistics never
        Connect Time = 1384, Charged Units = 0,
        Successful Calls = 1, Failed Calls = 0, Incomplete Calls = 0
        Accepted Calls = 0, Refused Calls = 0,
        Last Disconnect Cause is "10  ",
        Last Disconnect Text is "normal call clearing (16)",
        Last Setup Time = 41369385.
        Last Disconnect Time = 41371110.
Matched: 7004   Digits: 5
MNPR001#sh dial-peer voice summary | inc 7004
20193  pots  up   up             7004$              0                           50/0/104
20194  pots  up   up             64367004$          0                           50/0/104
MNPR001#show ver
Cisco IOS Software, 2800 Software (C2800NM-SPSERVICESK9-M), Version 12.4(20)T4, RELEASE SOFTWARE (fc4)
Technical Support:
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Tue 01-Sep-09 16:07 by prod_rel_team

ROM: System Bootstrap, Version 12.4(1r) [hqluong 1r], RELEASE SOFTWARE (fc1)

MNPR001 uptime is 2 weeks, 5 days, 14 hours, 27 minutes
System returned to ROM by power-on
System restarted at 17:00:35 WST Thu Dec 13 2012
System image file is "flash:c2800nm-spservicesk9-mz.124-20.T4.bin"

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Cisco 2851 (revision 53.51) with 247808K/14336K bytes of memory.
Processor board ID
2 Gigabit Ethernet interfaces
21 Serial interfaces
1 terminal line
1 Channelized/Clear E1/PRI port
2 Voice FXO interfaces
2 Voice E & M interfaces
1 cisco service engine(s)
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
515088K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102

3 Replies 3

paolo bevilacqua
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Update IOS and check again.


Update to symptoms....

I cut the number or users assigned to the shared line down to 2 from 7 and rebooted the router, now the symptoms seem to have changed. Now when a call comes in on the shared line, the operator is unable to transfer the call.

Do you think it could be a DSP allocation issue?

Does this change your recommendation to perform an upgrade? Anyways I have an upgrade scheduled for next week so then we should know.



IOS upgrade had no effect.

After further testing it appears that when there are more than 1 phone assigned the shared line button, the symptoms appear.

Any input regarding this would be appreciated.

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