[SIPForum-techwg] New Seq Number in 'Early Media' scenario

[Vincent]

        Hi,
           Could u help me out how a "SIP Application Server" performs
CallWaiting Service.
           How does a "SIP Application Server" initiate both the calling and
the called users about the waiting of the call.
           Can u show me in form of call flow.
           Does "SIPAS" sends 180 ringing to calling user with "Alert-Info"
header field and an INVITE with "Alert-Info" to the called user and how does
it exactly happens.

       with regards
        Vincent P.
  -----Original Message-----
  From: techwg-bounces at sipforum.org [mailto:techwg-bounces at sipforum.org]On
Behalf Of Graziani, Germano (Germano)** CTR **
  Sent: Wednesday, September 13, 2006 6:21 PM
  To: SIP Forum Tech WG
  Subject: [SIPForum-techwg] New Seq Number in 'Early Media' scenario


  Hi, this is Germano from Rome.



  We’re noticed a strange behaviour by a softphone used into a early Media
scenario.



  Between IMS and called party there is a MGW.



  In particular:



    1.. INVITE sent correctly with empty SDP,
    2.. 100 Trying,
    3.. a “407 Proxy Authentication Required” was received,
    4.. a new INVITE sent by softphone with sdp info,
    5.. then a lot of RTP messages received back with Payload, SSRC, Seq and
Time fields populated.


  In some scenario the Seq field start by 0 and was increased by 1 during
the call and called and caller were correctly connected.



  In another scenario the Seq field start by 0 and was increased by 1 during
the call … but suddenly it was reset to zero e sequential re-start again as
previously.



  In this last case called was able to listen calling, instead calling was
not able to listen called party.



  Is there someone able to help me details previous scenario and understand
the reason for problem ?



  Is this a MGW or device problem ?



  Regards. Germano.





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  Germano GRAZIANI

  gg46 at lucent.com

  Senior Software Tester Engineer

  Covansys Telecom Practices

  gg46 at lucent.com <mailto:gg46 at lucent.com>

  Via Cesare Giulio Viola 65

  phone references: +39 06 6553 494 - 493

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