Cisco BE6k with CUCM 10.X integration with Siemens with Hipath 3350 and 3550

Question

Dear Experts;
We have one requirment from customer.
They have 4 branches with Siemens Hipath 3350 and 3550  PBX and they want to integrate with cisco CUCM 10.x.
The Head Quater with complete CUCM as IPT and branches with with Hipath 3350 and 3550  PBX.
CIsco TAC says interoperability doc is not available and also I can see tehre is no doc.
TAC Reply  As below.
We do not have any documents about CUCM integration with Hipath 3350 and 3550 on our interoperability portal. This means that their integration with CUCM was never properly tested. So we can not confirm that all features will be working. But from CUCM perspective this is third-party device that can be integrated using SIP or ISDN (with Voice Gateway between them).
Link for interoperability portal:
http://www.cisco.com/c/en/us/solutions/enterprise/interoperability-portal/networking_solutions_products_genericcontent0900aecd805b561d.html#callmgr10
Regards
Debashis

Answer 1

If the Siemens supports SIP or H323 you can attempt to simply create a trunk between the systems and route calls via it.  If IP integration is not an option then as pointed by TAC integrate via PRI circuit (preferably QSIG). From CUCM side it will be just another GW, similarly from Siemens side.  You'll need to select which side is going to be ISDN network (I always use Cisco side) and then make the other side user.