SIP Trunking between 2 different networks

[techguy]

Hi,

Can anyone confirms me that in order to establish SIP trunk between two IP PBX resided in different networks, what is the requirement?

providing that IP PBX doesn't have WAN port. 

[Alyza Marie Reyes]

Hello omerpal1190,

You might want to look at Cisco Unified Border Element  solution that will help you do SIP trunking easier. Kindly refer to the link attached for more information about the additional requirements that you might still need.http://www.cisco.com/c/en/us/products/collateral/unified-communications/unified-border-element/data-sheet-c78-729692.html

Hope this helps! If you need additional assistance regarding this, please feel free to send me an email at alyreyes@cisco.com.

Regards,

Alyza Reyes