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-rw-r--r--openbsc/doc/sgsn-remote-protocol.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/openbsc/doc/sgsn-remote-protocol.txt b/openbsc/doc/sgsn-remote-protocol.txt
index 7ca9094e6..656447188 100644
--- a/openbsc/doc/sgsn-remote-protocol.txt
+++ b/openbsc/doc/sgsn-remote-protocol.txt
@@ -21,6 +21,12 @@ that understands the protocol natively or a wrapper service that maps the
messages to/from real MAP messages that can be used to directly communicate
with an HLR.
+2.1. Using IPA
+
+By default, the following identifiers should be used:
+ - IPA protocol: 0xee (OSMO)
+ - IPA OSMO protocol extension: 0x05
+
2. Procedures
2.1. Authentication management