add X-Osmo-IGN MGCP header to ignore CallID
The format is
CRCX ...
C: ...
M: ...
X-Osmo-IGN: C
So far the only ignorable element is C, i.e. the CallID. Any other items may be
added in the future.
(I initially intended to also add '@' to ignore the endpoint name's domain
part, but in the osmo-mgw code base the domain part is verified long before any
additional headers are even parsed, so sparing that refactoring for now.)
The intention is that osmo-bsc will issue "X-Osmo-IGN: C" for all SCCPlite
calls, because we are unable to retrieve the CallID that the MSC sends to
osmo-mgw for the network side of the endpoint.
Testing with a specific SCCPlite MSC, I actually observe that all CallIDs are
1, even for concurrent calls. So, an alternative hacky solution would have been
to always pass CallID == 1 for SCCPlite connections from osmo-bsc.
Related: I257ad574d8060fef19afce9798bd8a5a7f8c99fe (osmo-bsc)
Change-Id: Id7ae275ffde8ea9389270cfe3db087ee8db00b51
diff --git a/include/osmocom/mgcp/mgcp_endp.h b/include/osmocom/mgcp/mgcp_endp.h
index 3876794..d834c09 100644
--- a/include/osmocom/mgcp/mgcp_endp.h
+++ b/include/osmocom/mgcp/mgcp_endp.h
@@ -90,6 +90,9 @@
/*! Memorize if this endpoint was choosen by the MGW (wildcarded, true)
* or if the user has choosen the particular endpoint explicitly. */
bool wildcarded_req;
+
+ /*! MGCP_X_OSMO_IGN_* flags from 'X-Osmo-IGN:' header */
+ uint32_t x_osmo_ign;
};
/*! Extract endpoint number for a given endpoint */