Can anyone please give me some links to download the documents to understand the PGWs used in UCCE setup.
Visit below URL, hope it will help to understand the PGW placement in front of UCCE.
In combination of UCCE and PGW (signaling), UCCE point of contact is Voice Gateway rest is behind the Voice Gateway between PGW and ITP/SLT.
don’t hesitate to ask if you want to discuss anything else.
Muhammad Amir Raza