Phoner(Lite) Forum - SRTP Authentication Failure about 5-10% of calls

04. May 2024 at 11:06

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SRTP Authentication Failure about 5-10% of calls (Read 3579 times)

Burton Samograd YaBB Newbies Offline Phoner is great! Posts: 2 Joined: 13. Feb 2012	SRTP Authentication Failure about 5-10% of calls 13. Feb 2012 at 17:46	Print Post
	Hello, I am developing a SIP application and I am using PhonerLite as one of my test phones because it has SRTP support. About 5-10% of the calls fail due to SRTP authentication failure on our application end. I have tested with 3 clients and 2 of them fail in this way; the one that never seems to fail (or at least has not yet) is Blink. I am wondering, what version of libsrtp does PhonerLite use? Our product is currently using srtp-1.4.2.tgz which is the last version available. Has PhonerLite kept up with libsrtp releases? From what I can tell, with 2 of the 3 phones exhibiting this problem, I think it might be a client difference, but I am not ruling out a bug on our end. Thank you and I hope you can help track down this problem by providing the version of libsrtp you are using in PhonerLite. -- Burton Samograd


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Phoner Admin YaBB Administrator Offline Posts: 11421 Location: Germany Joined: 12. Oct 2003 Gender:	Re: SRTP Authentication Failure about 5-10% of calls Reply #1 - 14. Feb 2012 at 08:51	Print Post
	I assume there are some problems in the way the SRTP key is encoded in SDP. To very this it would be good, if I can get your application to test with. You can send me the SIP messages with SDP and crypto line for a call that fails. If I understand you right, RTP will be encrypted but you can't decrypt the data you get from PhonerLite? I am using libSRTP in the actual version but I am using the AES and SHA implementation from OpenSSL.


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Burton Samograd YaBB Newbies Offline Phoner is great! Posts: 2 Joined: 13. Feb 2012	Re: SRTP Authentication Failure about 5-10% of calls Reply #2 - 14. Feb 2012 at 22:12	Print Post
	Thank you for the reply. I have traced down the bug to our sipX library that was assuming that the keys were in ASCII and not just binary data. I have corrected the code and it all works fine now. No problem at all with PhonerLite!


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Phoner Admin YaBB Administrator Offline Posts: 11421 Location: Germany Joined: 12. Oct 2003 Gender:	Re: SRTP Authentication Failure about 5-10% of calls Reply #3 - 15. Feb 2012 at 08:59	Print Post
	Thanks for that update.


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