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-rw-r--r--callagent/transactions/SIPTransaction.st2
1 files changed, 1 insertions, 1 deletions
diff --git a/callagent/transactions/SIPTransaction.st b/callagent/transactions/SIPTransaction.st
index ad07d83..a3f8bbb 100644
--- a/callagent/transactions/SIPTransaction.st
+++ b/callagent/transactions/SIPTransaction.st
@@ -214,7 +214,7 @@ Object subclass: SIPTransaction [
auth := aResp parameter: 'Proxy-Authenticate' ifAbsent: [nil].
auth ifNil: [^self wrongAuth: aResp dialog: aDialog].
- ((auth at: 'algorithm') = 'MD5')
+ ((auth at: 'algorithm' ifAbsent: ['MD5']) = 'MD5')
ifFalse: [^self wrongAuth: aResp dialog: aDialog].
((auth at: 'qop') = 'auth')