ISUP: support transfer capability interworking with Q.931 #13
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A Q.931 call has the 'transfer-cap' attribute set to 'udi' for data calls. The ISUP module must pick this up and encode it in the UseServiceInformation IE to preserve this vital information. Inversely, a call arriving via ISUP must put its transfer-capability into the 'transfer-cap' attribute, so that when it's routed to Q.931 it is preserved. Without this transfer-capability transparency, no UDI/RDI data calls or ISDN video calls can transition on the Q931/ISUP boundary See also yatevoip#12
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A Q.931 call has the 'transfer-cap' attribute set to 'udi' for data calls. The ISUP module must pick this up and encode it in the UseServiceInformation IE to preserve this vital information. Inversely, a call arriving via ISUP must put its transfer-capability into the 'transfer-cap' attribute, so that when it's routed to Q.931 it is preserved.
Without this transfer-capability transparency, no UDI/RDI data calls or ISDN video calls can transition on the Q931/ISUP boundary
See also #12