We received a few Juniper SRX 210 routers over the past two weeks and I finally found the time to break one out of the box and set it up. Thankfully myself and another co-worker had attended a day long training class on JUNOS put together by the local Juniper sales team.
After spending a few hours Friday night and a few hours on Sunday night I finally managed to get the IPSec tunnel up this evening between the Juniper SRX 210 (10.1B4) and the Avaya/Nortel VPN Router 1700 (7.50_059). I still need to spend some time getting the DHCP relay working along with multiple IP networks (currently only have a single IP network defined).
You absolutely need "Vendor ID" and "Compression" disabled within the Avaya/Nortel VPN router.
Hopefully I'll be able to document the configuration and post it up to the blog in the next few days.
Cheers!