>>I would like sp1 to transfer phone calls to my communigate pro sever?
I have not done it but I suspect you may want to Call Forward, format: TK(number), TK = trunk SPn, PP1, VGn, TGn, BTn, or LI1. No digit map or call routing rules are applied to the number. Probably more ways than one to do it?
>>Also can some clarify ITSP profile and SP1 service. Is one incoming and the other outgoing.
No. They both relate to voice service configuration. One voice service SIP account = one SPn configuration. Part of that configuration includes server details that are configured separately under an ITSP profile. Why?... so that several SPn configurations can reference the same ITSP profile. For example, Phone Power server details are configured in ITSP profileA; then more than one SPn voice account can reference the same server details in ITSP profileA. It's basically a database grouping to minimize/eliminate redundant data/data entry... one or many SPn to one ITSP profile.
One voice service SIP account SPn can transport many SIP sessions/channels inbound and outbound simultaneously, subject to rate plan limits and practical limits at the endpoints i.e. on the analog side of the ata, you and your phones can only handle so many calls at one time... I struggle with a call waiting! :-)