grails in sailfin converged sip servlet container

i'm trying to do something different with Grails that will be great
for Grails and the SIP servlet community if it works out - but a few
words describing the problem context before i get to my problem:

SIP is a protocol for voice-over IP and SailFin is an open source SIP
servlet container (https://sailfin.dev.java.net/) sponsored by Sun and
Ericsson - the SailFin container effectively combines a SIP servlet
container from Ericsson with Sun's open source GlassFish 2.2 HTTP
servlet container - SailFin is called a 'converged' container because
a deployed application (e.g. a war file) can contain *both* SIP
servlets and HTTP servlets

because SailFin includes GlassFish, i've been able to run Grails 1.0.3
apps in the SailFin container with no problem but now i'm trying to
"attain convergence" by packaging a SIP servlet app and a Grails app
together in the same war file - what i want to do is have a doXXX()
method invocation in the *SIP servlet* access my Grails app's domain
model (either via a Grails service method or directly)

what i'm trying to do appears to be a special case of Java (the SIP
servlet doXXX method) accessing Grails (a Grails service method) but
in this case the Grails app hasn't been invoked in response to an HTTP
request - instead, the SIP servlet is being invoked in response to a
SIP message - because there is no HTTP request involved in this
scenario it doesn't appear possible to use the Spring bean approach
described in section 8 of the Grails manual  ("the service layer"
http://grails.org/doc/1.0.x/guide/8.%20The%20Service%20Layer.html)

so is there some way a service instance can be created outside of the
context of handling an HTTP request? if not, are there any other ways
that the Java code in the SIP servlet could access a Grails service
method or the domain model classes packaged in the same war file?

i'm thinking that there must be a solution better than the
"stand-alone" GORM approach (http://grails.org/GORM+-+StandAlone+Gorm)
because the SIP servlet and the Grails app are packaged in the same
war file and therefore have access to each other's compiled code

any help here would be greatly appreciated - this won't just help me -
solving this problem would be a big contribution to the burgeoning
telecom-over-IP community since combining Grails with SIP servlets
would enable developers to put together converged telecom applications
really quickly

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