osmo-ggsn does not react properly when the PDP CTX ACT PCO contains primary and secondary DNS in separate IPCP
When a PDP CONTEXT ACTIVATE message with a PCO that contains Primary and Secondary DNS in separate IPCP containers is recaived, then only the first of the two containers is interpreted and the second one is ignored.
Since almost all phones send PDP CONTEXT ACTIVATES where primary and secondary is in a single IPCP container this is quite a corner case situation. However some phones (e.g. Blackberry 9780) behave different.