Yes using EHX V7.5 or later firmware you can intelligently link Eclipse HX matrices using IP trunks / tie lines between two IVC-32 cards in separate matrices.  
The Eclipse IVC-32 cards allow trunks over IP network infrastructure. All IP trunks and can be compared directly to four-wire trunks. They comprise:
• A single duplex audio channel
• A known start point and end point
Links have to be made over IP before the trunk can be used.

Open

Configuring an IP trunk
1) In the Cards and Ports screen, for each of the IVC-32 cards, right click on the card and select Card Properties.
2) From the IVC-32 Card Properties screen, enter valid IP addresses and gateways for the card.
3) In the Cards and Ports screen, select the trunk port.
4) From the properties list, select IP Port Options, and enter valid settings for the Network Connection, Audio Codec and VOIP Caller.

Open

5) Repeat for any matrices in the linked set you wish to link over IP (1 port per trunk link, point to point).
6) In the Layout screen, drag the trunk links as required. The direction of the drag creates the link as Caller to Recipient.
Note: Right clicking on the link and the ports allow you to change caller, network connection type and flip ports.

Open

Note:  the VOIP caller lets the linked frames know which frame will initiate setting up the underlying IP link once the IP link is established the link stays up all the time even if there is no audio traffic. This is done to reduce call setup times. This is not the same as which frame makes the actual audio trunk call, but rather how the underlying IP connection is setup initially between the two frames.