I don't think this is possible or at least it will be resource heavy if you just want a SIP trunk between Spark and Asterisk and don't use Cisco Unified CM for other purposes. You could set up Cisco Spark Hybrid Services with Cisco Expressways and Cisco Unified CM and make a SIP trunk between CUCM - Asterisk.
Here you can find the design for Spark hybrid services and find some additional information. But I don't know if that will solve your use case.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...