CME Ad-Hoc Conference Setup

In short;

  • Configure “Conference Hardware” under “telephony-service” then “voice register global”
  • Create dspfarm conference bridge profile
  • Associate conference bridge profile with sccp ccm group
  • add sdspfarm tag to telephony service
  • Create ephone-dn for AdHoc Conference number (used behind the scenes)
  • Check dspfarm profile session numbers, sdspfarm units and transcode sessions if external parties will be in on conference and XCODE is required.
Need to look at why we needed 4 sessions for XCODE , poss both calls plus DTMF ?


voice register global
conference hardware
sccp ccm group 1
associate profile 2 register CFB_BR3_GW
associate profile 1 register mtpa0ecf9440b88
dspfarm profile 1 transcode
codec g729abr8
codec g729ar8
codec g711alaw
codec g711ulaw
codec g729r8
maximum sessions 4
associate application SCCP
dspfarm profile 2 conference
codec g729br8
codec g729r8
codec g729abr8
codec g729ar8
codec g711alaw
codec g711ulaw
maximum sessions 1
associate application SCCP
sdspfarm units 2
sdspfarm transcode sessions 4
sdspfarm tag 1 mtpa0ecf9440b88
sdspfarm tag 2 CFB_BR3_GW
conference hardware
ephone-dn  10  octo-line
number A5009999
conference ad-hoc
no huntstop



  • sh sccp connections
  • show call act voice comp
  • show telephony-service conference hardware ad-hoc detail
  • show ephone-dn conference ad-hoc

BR3#show telephony-service conference hardware ad-hoc detail
Conference   Type              Active  Max  Peak    Master         MasterPhone   Last
A5009999     Ad-hoc                3     8     3    5001004 Dogg   2     (  2)   3008100 Juli
Conference parties (number:phone)
3008100 Julia Coll (8100)
5001005 simon :1
5001004 Doggie :2

Tracing a call through IOS CME with CFB and XCODE.

This shows a conf in session on CME, with two local phones (SIP & SCCP) and one remote SIP phone (CUCM connected). The remote SIP phone is restrcited to G.729 over the trunk to CME from CUCM. The CME CFB is configured for G.711 only.
The two local phones connected using G.711 to the CFB, the remote phone (BR1) uses G.729 over the WAN to the XCODE on the CME router which XCODEs to G.711 and onwards to the CFB.

How do we see this in show commands;

Find the BR1 call into CME

BR3#sh sip-ua calls brief 
Total SIP call legs:3, User Agent Client:2, User Agent Server:1

No.    CallId        Calling#                 Called#             RmtSignalIP         RmtMediaIP
dstCallId   SIPState                  SIPSubState
1        393             5001004                 5001005

2        401             5001004                 3008100

Number of SIP User Agent Client(UAC) calls: 2

No.   CallId       Calling#                  Called#             RmtSignalIP      RmtMediaIP
dstCallId  SIPState                   SIPSubState
1       392            5001004                 5001005 

Number of SIP User Agent Server(UAS) calls: 1

Using the Call ID 401.

BR3#sh sccp connections callid 401 Connection Details : 16         Connection ID: 16         Session ID: 131075         Service Type:   xcode         Mode: sendrecv         Codec: g729         Packetization Period : 20         Remote IP Address :         Remote Port  : 2000         Local IP Address  :         Local Port  : 16430         rtpspi call ID : 421         transmsp call ID : 416         DTMF Method  : rfc2833_pthru Timestamps for the Messages         ORC : 3951052         STMT : 3951088         CRC : 0         SPMT : 3951088         Disconnect IND : 0         PREQ  : 0         PC  : 0         QOSL  : 0         QOST_R  : 0         QOSP  : 0         QOST_S  : 0BR3#


Simon Birtles

I have been in the IT sector for over 20 years with a primary focus on solutions around networking architecture & design in Data Center and WAN. I have held two CCIEs (#20221) for over 12 years with many retired certifications with Cisco and Microsoft. I have worked in demanding and critical sectors such as finance, insurance, health care and government providing solutions for architecture, design and problem analysis. I have been coding for as long as I can remember in C/C++ and Python (for most things nowadays). Locations that I work without additional paperwork (incl. post Brexit) are the UK and the EU including Germany, Netherlands, Spain and Belgium.

One thought on “CME Ad-Hoc Conference Setup

  • Adriana Maciel

    Your description helped me with this topic. The items you listed on “in short” session organize the ideas and clarify the steps required.

    Great contribution!

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