Sangoma Vega 400 E1 ISDN to SIP conversion

Description

We are seeking a freelancer to assist us in setting up a Sangoma Vega 400g Voice gateway for E1 ISDN to SIP trunk conversion with a Swedish telco called Telia. The gateway is connected to a PBX that is sending local area dial codes, but we need to insert the full international dial codes (+46 or +44) in the header for the carrier to route the calls.
The issue we are facing is that Telia requires P-Asserted-Identity (P-AI) format, while we are currently sending P-Preferred URI format. We have tried changing the P-Asserted to RFC3325, but it has not made any difference.
We require the freelancer's expertise to configure the Sangoma Vega 400g gateway correctly to send P-Asserted-Identity format. The freelancer should be able to review our current gateway configuration and make the necessary adjustments to ensure that the calls are routed properly.
We are looking for a freelancer who has experience with Sangoma Vega gateways and SIP trunking. The freelancer should be able to work independently and provide regular updates on the progress of the project.
If you are a freelancer with the required expertise and experience, please submit your proposal for this project. We are excited to work with you and resolve this issue.