Support for multiple IMS dedicated bearers #211
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In a scenario where we've got multiple calls on a single UE (Ie Call Hold / Toggling between calls, or call conference) the
Charging-Rule-NameAVP was always set to "GBR_Voice".This meant that if a UE was on a call, a charging rule named "GBR_Voice" was installed into the P-GW.
If the UE switched to another call, the P-CSCF sets up a new GBR bearer on Rx, but the PCRF tries to install a new Charging rule, also named "GBR_Voice" which removes the last.
This patch simply appends the SessionID of the Rx session, which is unique to the SIP call on the P-CSCF.