I am in the same situation as Garland (2 years later). I know that it can be done witch ACI-toolkit, but that implies having to deal with 2 external modules.   I've also found in https://github.com/datacenter/cobra that the branch eventchannel was created 3 years ago, however it is still not included in the lastest versions of Cobra, and there is no documentation available to use this branch.   Also, I tried to contact via email to the cobra support team at acicobra@external.cisco.com to ask, but it seems that this email address is no longer available.   Having passed 2 years since the initial request, could you please tell me when event subscription is going to be available natively in Cobra? Please help.   Thank you very much. ... View more

jcgutierrez, I understand that you receive the "483 Too Many Hops" when you are not being affected by the ip routing issue, that should keep the SIP Trunk up. Also I am assuming that you lose connectivity with the SBCs but not between the CUCM nodes in the cluster. So, did you try disabling the "Run on all nodes" in the SIP Trunk (just use a DP with a CUCM group that cointains CUCM A, B and C)?  Then, keep Run no all nodes only in the Route List. Acording to SRND 8.x: "If both the route list and the trunk have Run on all Active Unified CM Nodes enabled, outbound call distribution will be determined by the node on  which the inbound call arrives. When the selected outbound trunk uses  Unified CM Groups instead of running on all nodes, Unified CM will apply  the route local rule if an instance of the selected outbound trunk  exists on the same node on which the inbound call arrived. If an  instance of the trunk does not exist on this node, then Unified CM will  forward the call (within the cluster) to a node where the trunk is  active." http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/8x/uc8x/trunks.html ... View more

Hi jcgutierrez, Do you have SIP OPTIONS PING enabled on the SIP Profile of the SIP Trunk? Juan ... View more

Please post relevant gateway config. That should help! ... View more

Thank you!, excellent document, very usefull. ... View more

yes that is what I was suggesting Regards ... View more

Try this to change the directory number of the Nokia to the hash in the SIP req uri  header: voice service voip allow-connections sip to sip sip        bind control source-interface XXX   bind media source-interface XXX   registrar server   sip-profiles 1 !         voice class sip-profiles 1 request INVITE sip-header SIP-Req-URI modify "sip:752@(.*) SIP/2.0" "sip:3HkqSha_SBZaN-Mrfjb4@\1 SIP/2.0" ! voice register global mode cme source-address XXXX port 9090 no outbound-proxy no privacy max-dn 20 max-pool 20 authenticate realm XXXX create profile sync 0554118347449519 ! voice register dn  1 number 752 name E52 ! voice register dn  2 number 771 name E71 To capture the hash, do a debug ccsip messages and look at the REGISTER message. HTH ... View more