To support multisite BSR, networks must meet both the criteria for LAI call control operation over switched networks and the following criteria:
The network must support end-to-end transport of codeset 0 user data, either as a User-to-User Information Element (UUI IE) or by a QSIG Manufacturer Specific Information (MSI IE), in the ISDN SETUP and DISCONNECT messages.
With BSR poll calls, information is forwarded in the DISCONNECT message. In this case, the network must support forwarding of UUI in the first call clearing message, while the call is still in the call proceeding state, prior to the active state.
Private networks can be configured for either QSIG using MSI packaged in codeset 0 Facility IEs or non-QSIG using a codeset 0 UUI IE transport. Currently, public networks cannot be configured for QSIG and user data can only be transported by the UUI IE when supported by the network. Future public network can be configured for QSIG, possibly by a Virtual Private Network (VPN).
The switch must support the ISDN country protocol.
The network byte limit for the user data portion of the user information contents must be large to carry the data needed for the customer application.
Note:
Some public network providers can require service activation, fees for user information transport, or both.
BSR, LAI, enhanced information forwarding, and UCID have been tested with several major carriers. To find if the capabilities work with your carrier, check with your account team for the most current information.
If testing has not been done to verify operation over the public networks that are involved with the preferred specific configuration, use private ISDN trunking between the nodes until successful testing is complete.
