Hi, i´m triying to do call fwd external over ip ccis links. We have three ips linked by IP-CCIS, one with a PRI to telco, second one with the centralized vmail, and the third one that having problems to do the fwd.
I programmed a DID number to terminate at third system, but cannot follow the fwd to vmail. On analog trunks or network calls works fine.
Any solution?

Is that three IPS (Neax IPS2000s)?

First, verify that you can place a call over IP to and from each location. I recommend assigning a trunk access code to eliminate ARS/LCR from the equation.

If you can place a call over IP to each location, check the 8A4007 table at each site. For the PRI site and the third, uninvolved site, the path to VM should be the route number to take, i.e., for extension 555 going to voicemail 222,

Site A (with PRI):
8A4007>555>8003 ("this three-digit extension lives here")
8A4007>222>0010 ("this extension (VM pilot) lives at the site found on route 0010")

Site B (with voicemail)
8A4007>222>8003 ("this extension lives here")
8A4007>555>0009 ("this extension lives at the site indicated by route 0009.")

Please note that if you used 8A4005 or 8A4006 to route these transfers, it will strip digits.

Also verify that 7601 and 7600 are not being used to change incoming DID information. The IPS looks at 76yy before looking at 20y or 8Ayyyy.

Oh, also verify that the phone being forwarded has a COR that permits use of the IP trunks (1201/81yy).

While you're at it, is the PRI permitted to connect to IP trunks?