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ISUP: support transfer capability interworking with Q.931 

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 https://github.com/yatevoip/yate/issues/12
This commit is contained in:
Harald Welte 2023-12-03 16:19:41 +01:00
parent a66e3dd9de
commit 3701992c74
1 changed files with 2 additions and 0 deletions
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2
libs/ysig/isup.cpp
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@ -2808,11 +2808,13 @@ bool SS7ISUPCall::copyParamIAM(SS7MsgISUP* msg, bool outgoing, SignallingMessage
param(dest,src,"CallingPartyNumber.complete","complete","true");
m_format = src.getValue(YSTRING("format"),isup()->format());
dest.setParam("UserServiceInformation",m_format);
param(dest,src,"UserServiceInformation.transfercap","transfer-cap","");
return true;
}
// Incoming call
m_format = dest.getValue(YSTRING("UserServiceInformation"),isup()->format());
dest.setParam("format",m_format);
dest.setParam("transfer-cap",dest.getValue(YSTRING("UserServiceInformation.transfercap")));
dest.setParam("caller",dest.getValue(YSTRING("CallingPartyNumber")));
//dest.setParam("callername",dest.getValue(""));
dest.setParam("callernumtype",dest.getValue(YSTRING("CallingPartyNumber.nature")));