In CUCM, one SIP Trunk is added per each provider, with a different SIP Trunk security profile.
Taking this information into account and that CUBE has the ability, not only to match dial-peers based on numbers, but also based on the URIs of different SIP headers, you are now able to do the incoming dial-peer matching (from CUCM to CUBE) based on that port.
Matching based on URIs in generally gives you the power, to be independent of any calling or called numbers, using to match dial-peers (Awesome, isn't it?)
Ok, let's look at a configuration example on CUBE:
! From CUCM to CUBE
voice class uri 1000 sip
pattern :5560 --> Matches a pattern in the Via header, in this case the pattern is ":5560"
voice class dpg 1000
dial-peer voice 1000 voip
description ### Incoming from CUCM ###
incoming uri via 1000
destination dpg 1000 --> Automatically assigns the correct outbound dial-peer
! From CUBE to CUCM
voice class server-group 1001
ipv4 [CUCM-IP] port 5560
dial-peer voice 1001 voip
description ### Outgoing to CUCM ###
session server-group 1001
"bind interface…" commands are configured in the tenants or in the dial-peer configuration, to use the correct interface for sending internal traffic via the internal interface, and external traffic via the external interface.
What are the advantages:
No need to use number prefixes in CUCM / CUBE and all the hazzle adding and stripping them off again. Also, if configured in the wrong place in CUCM, the prefixes could be reflected on the phone display after translations (which isn't nice for the users)
No need for additional IP addresses on the CUBE and possible problems with IP routing
In CUCM it is still possible to add more SIP Trunks with the same destination IP addresses, since the port in the SIP Trunk security profile assigned to the trunks are different (CUCM checks for a combination of IP address + incoming port)
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