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<div>CUCM's involved are all some 8.x variant, and the trunks are all SIP.</div>
<div><font face="tahoma">It's a slightly complicated setup (for reasons too long to explain here) so here's a drawing:</font></div>
<div><a href="http://s1115.beta.photobucket.com/user/kdotzoltan/media/CallFlow_zps0ad6283d.png.html">http://s1115.beta.photobucket.com/user/kdotzoltan/media/CallFlow_zps0ad6283d.png.html</a></div>
<div><font face="tahoma">(excuse my lack of artistic skills :) )</font></div>
<div><font face="tahoma"></font> </div>
<div><font face="tahoma">I haven't thought about looking at CCM traces, but will be doing so tomorrow.</font></div>
<div><font face="tahoma"></font> </div>
<div><font face="tahoma">Cheers,</font></div>
<div><font face="tahoma"> Zoltan</font></div>
<div><font face="tahoma"></font> </div>
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<font color="#000000" size="2" face="Tahoma"><b>From:</b> Ryan Ratliff [rratliff@cisco.com]<br>
<b>Sent:</b> Tuesday, January 29, 2013 5:50 PM<br>
<b>To:</b> Kelemen, Zoltan [CORP/RO]<br>
<b>Cc:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> Re: [cisco-voip] FACILITY / Mandatory information element missing on ISDN PRI to PBX<br>
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<div>What version of CUCM, and what do the ccm traces show around the time the facility is generated? I assume this is an MGCP PRI?
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<div><span class="Apple-style-span">-Ryan</span> </div>
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<div>On Jan 29, 2013, at 6:17 AM, <a href="mailto:Zoltan.Kelemen@emerson.com">Zoltan.Kelemen@emerson.com</a> wrote:</div>
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Hi,</div>
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A IOS Gateway is given that connects through a E1 ISDN PRI to a Nortel PBX, The router acting as network side. (primary-net5)</div>
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Calls are coming in through a SIP trunk from two different CUCM clusters (both being trunked to a central CUCM cluster that only acts as a call router).</div>
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Call setup works in both cases, SIP messages seem identical (through debug ccsip messages)</div>
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However, once the call is established, on calls coming from “SITE A”, a FACILITY message is sent towards the PBX, with no information element. Because of this the PBX throws an error and the gateway disconnects:</div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">Jan 28 12:55:44.291 UTC: //478350/9DBBB8800000/CCAPI/cc_api_call_facility:</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt"> Interface=0x311D76B8, Call Id=478350</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">Jan 28 12:55:44.291 UTC: //478351/9DBBB8800000/CCAPI/ccCallFacility:</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt"> Call Id=478351</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">Jan 28 12:55:44.291 UTC: ISDN Se0/0/0:15 Q931: TX -> FACILITY pd = 8 callref = 0x0423</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">Jan 28 12:55:44.311 UTC: ISDN Se0/0/0:15 Q931: RX <- STATUS pd = 8 callref = 0x8423</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt"> Cause i = 0x81E0 - Mandatory information element missing</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt"> Call State i = 0x0A</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">Jan 28 12:55:44.311 UTC: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT pd = 8 callref = 0x0423</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt"> Cause i = 0x82E0 - Mandatory information element missing</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">Jan 28 12:55:44.355 UTC: ISDN Se0/0/0:15 Q931: RX <- RELEASE pd = 8 callref = 0x8423</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">Jan 28 12:55:44.355 UTC: ISDN Se0/0/0:15 Q931: TX -> RELEASE_COMP pd = 8 callref = 0x0423</span></div>
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Calls from “SITE B” never generate this facility message so the call works as expected.</div>
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I tried to block forwarding of facility messages altogether on the PRI, but it doesn’t seem to make any difference (not even after restarting the serial interface):</div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">interface Serial0/0/0:15</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">description VOICE|E1 PRI towards local Nortel PBX</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">no ip address</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">encapsulation hdlc</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">isdn switch-type primary-net5</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">isdn protocol-emulate network</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">isdn incoming-voice voice</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">no isdn outgoing ie facility</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">no cdp enable</span></div>
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<span style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">!</span></div>
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Any clues as to what triggers the facility manager in the CUCM setup and/or how can I block this on the gateway?</div>
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Thanks,</div>
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<b><span style="FONT-FAMILY: Arial,sans-serif; COLOR: rgb(15,36,95)">Zoltan Kelemen</span></b><b><span style="FONT-FAMILY: Arial,sans-serif; COLOR: rgb(15,36,95); FONT-SIZE: 10pt"><br>
</span></b><span style="FONT-FAMILY: Arial,sans-serif; COLOR: rgb(102,102,102); FONT-SIZE: 10pt">Emerson</span></div>
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