I have a CUCM 8.6.2. I use a SIP trunk to make calls but i have a loop that i cant know how to avoid it.
172.23.132.18 is the CUCM.
172.23.129.35 internal SBC
172.23.129.48 external SBC
172.23.254.245 Alcatel OXE.
I want to know how can tell CUCM to stop when a 480 is received.
Thank you so much!
What is the SBC, is it Cisco CUBE?
It looks to me that the SBC is not providing proper disconnect cause thus not sending Cancel or Bye to CUCM, with CUBE you can map cause codes to SIP messages, i.e.
set pstn-cuase 18 sip-status 503
set pstn-cuase 19 sip-status 503
If you have another vendor's SBC then you may want to research equivalent. Otherwise you may want to decrease Retry SIP parameters on CUCM.