Hi, we did experience the exact same problem with Sippy, you need to put the URI in brackets: Benny helped us on the way. > > The INITE message goes to OpenSER and the this is passed on to Sippy. > And Sippy requires URI within brackets. > My question is if this is according to RFC's ? > Otherwise I'm going to complain to our ISP J Yes, I can confirm that Sippy is at fault here. The rule is, when the From/To header doesn't have brackets, then all parameters are treated as header parameters, not URI parameters. So according to RFC 3261, these From headers should be equal: a) From: sip:user@host;tag=1234 b) From: <sip:user@host>;tag=1234 It looks like Sippy interpret the tag parameter in a) as URI parameter (which is wrong), so in this case it interprets it as: c) From: <sip:user@host;tag=1234> which explains why it complained about missing From tag. Olle Frimanson Keystream AB S:t Olofsgatan 33B, 75330 Uppsala Tel: +46 18 4444375 Fax: +46 18 4444376 Mobile +46 70 6661875 <mailto:olle.frimanson at keystream.se> olle.frimanson at keystream.se www.keystream.se _____ From: pjsip-bounces@xxxxxxxxxxxxxxx [mailto:pjsip-bounces at lists.pjsip.org] On Behalf Of sre kdkjf Sent: den 2 januari 2008 11:30 To: pjsip at lists.pjsip.org Subject: error 400 From_tag required. Hi Benny, we are trying to make new application usign pjsip stack. As the registration is done perfectly. But when we are trying to make a call we are getting an error as status: 400 From_tag is requried. how to rectify this problem. and what we have to do to solve this problem. so that our call should work properly. please guide me how to solve this problem. waiting for ur guidence. As i am sending the marked capture packet information of that error as an attachment. please check out this once. _____ Never miss a thing. Make Yahoo <http://us.rd.yahoo.com/evt=51438/*http:/www.yahoo.com/r/hs> your homepage. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080102/46a79534/attachment.html