This patch to avp_radius module adds Acct-Session-Id to Access-Request According to RFC2866.
It is similar to patch 2046495 that does the same for the auth_radius module.
This attribute is a unique Accounting ID to make it easy to match start and stop records in a log file. The start and stop records for a given session MUST have the same Acct-Session-Id. An Accounting-Request packet MUST have an Acct-Session-Id. An Access-Request packet MAY have an Acct-Session-Id; if it does,
then the NAS MUST use the same Acct-Session-Id in the Accounting- Request packets for that session.
The purpose of this patch is to create a relationship between an auth and acct request, based on SIP CALL-ID value (Acct-Session-Id attribute).