Adding to what Ryan has mentioned, I would check with the Webserver team,
- If the call has to be a SOAP over HTTP call or a plain HTTP Call.
- If SOAP Over HTTP, then
- You can create a Custom Service Interface in PI with the IDoc as the message type.
- And use this in your SOAP Adapter
- If Plain HTTP,
- Check if they need a plain HTTP Post or they require additional HTTP Headers etc.
- If Plain HTTP Post, the HTTP Adapter can do the trick.
- If no, then you might need either REST Adapter like pointed by Ryan or probably additional customization of HTTP Headers in the HTTP Adapter of PI.
Regards
Bhavesh