[VoiceOps] Ye ole Cisco Cube CM

J. Oquendo sil at infiltrated.net
Tue Aug 10 17:05:00 EDT 2010

Because I don't care what ya trunk to me with (Avaya, Nortel, Cisco,
Asterisk, etc), I tend to care less about the "end" user's equipment as
I'm sure many here have had to do from time to time. (Interops with
Avaya one day, Nortel the next, intertwined with CCM here, Asterisk there).

Anyhow, was doing an interop with someone and they CUCM was sending
491's. Figured I'd ask here since I believe someone must have a "oh
yea... that stupid thing..." response. The scenario: Caller (Cisco
Equipment) --> Their Network --> The Interweb --> My network --> so on...

Caller --> My phone --> I pick up --> Their phone disconnects, immediate

SIP? Caller --> CCM --> Router --> My SBC --> SIP/200 OK

At that EXACT MOMENT of the SIP/200 OK:

CCM sees SIP/481 :

*Aug 10 20:38:45.295: //238407/000000000000/SIP/Call/sipSPICallInfo:
Disconnect Cause (CC)    : 16
Disconnect Cause (SIP)   : 481

Anyone have a generic Cisco router config they'd care to share? I was
fortunate enough to have them send me their end (implemented VoIP
related garbage):

voice call send-alert
voice call carrier capacity active
voice rtp send-recv

voice service voip
 allow-connections sip to sip
  bind control source-interface GigabitEthernet0/0.3
  bind media source-interface GigabitEthernet0/0.3

voice class codec 1
 codec preference 1 g729r8
 codec preference 2 g711ulaw

voice class h323 1
 h225 timeout tcp establish 3

ccm-manager fallback-mgcp
ccm-manager redundant-host xx.yy.z.15
ccm-manager mgcp
ccm-manager music-on-hold
ccm-manager config server xx.yy.z.16
ccm-manager config
fax interface-type fax-mail

interface GigabitEthernet0/0.3
 description Voice VLAN
 encapsulation dot1Q 3
 ip address xx.yy.z.1
 ip helper-address vv.vv.v.v4
 ip pim sparse-dense-mode
 ip cgmp
 no cdp enable

dial-peer voice 9000 voip
 description ** Outbound 10-digit **
 preference 1
 destination-pattern 1[2-9].........
 session protocol sipv2
 session target ipv4:this.is.me.at.33
 session transport udp
 fax-relay ecm disable
 no vad


 max-conferences 8
 ip source-address xx.yy.z.1 port 2000
 max-ephones 48
 max-dn 48
 transfer-pattern 503.......
 default-destination 2000
 voicemail xxxxxxxxxx

SIP Messages: (ala ngrep ;))

U this.is.my.ip.33:5060 -> this.is.their.ip.131:5060
SIP/2.0 200 OK
v: SIP/2.0/UDP this.is.their.ip.131:5060;branch=z9hG4bK1E3E
f: "SIP Test DID"<sip:1503xxxyyyy at this.is.their.ip.131>;tag=2633AAF8-1A7C
t: <sip:1212aaabbbb at this.is.my.ip.33>;tag=4483814b840cda0de9102ed591a599fc
i: 15E4B9A3-A3F611DF-91EEFF90-66FF34BF at this.is.their.ip.131
CSeq: 101 INVITE
m: <sip:+1212aaabbbb at this.is.my.ip.33:5060;transport=udp>
c: application/sdp
l: 111
o=- 58501 5850100 IN IP4 this.is.my.ip.38
c=IN IP4 this.is.my.ip.38
t=0 0
m=audio 18168 RTP/AVP 0 18

U this.is.their.ip.131:57731 -> this.is.my.ip.33:5060
CANCEL sip:1212aaabbbb at this.is.my.ip.33:5060 SIP/2.0
Via: SIP/2.0/UDP  this.is.their.ip.131:5060;branch=z9hG4bK1E3E
From: "SIP Test DID"
<sip:1503xxxyyyy at this.is.their.ip.131>;tag=2633AAF8-1A7C
To: <sip:1212aaabbbb at this.is.my.ip.33>;tag=4483814b840cda0de9102ed591a599fc
Date: Tue, 10 Aug 2010 20:38:36 GMT
Call-ID: 15E4B9A3-A3F611DF-91EEFF90-66FF34BF at this.is.their.ip.131
CSeq: 101 CANCEL
Max-Forwards: 70
Timestamp: 1281472724
Reason: Q.850;cause=16

Content-Length: 0..


J. Oquendo

"It takes 20 years to build a reputation and five minutes to
ruin it. If you think about that, you'll do things
differently." - Warren Buffett

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