19.3.3.2. SIP Subscriber at another OpenScape 4000 
Slave signaling to HG 3500 SIP subscriber board, slave payload to
the SIP subscriber.
SIP subscriber A sets up a call to OpenScape 4000 A. OpenScape 4000
A routes the call via a trunking connection to OpenScape 4000 B. OpenScape
4000 B then sets up a connection to SIP subscriber B. OpenScape 4000
B initiates a DMC between SIP subscriber B and SIP subscriber A, resulting
in an end-to-end payload connection.
