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[Sigtran] M3UA error "No Configured AS for ASP”

Suchetha P <suchethap@yahoo.com> Sat, 01 October 2016 06:07 UTC

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Date: Sat, 01 Oct 2016 05:59:45 +0000
From: Suchetha P <suchethap@yahoo.com>
To: sigtran@ietf.org
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Subject: [Sigtran] M3UA error "No Configured AS for ASP”
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Hi,

IuPS interface(Packet switching/data interface) between the nodes  Signalling Gateway and SGSN is down after the Trillium SIGTRAN Stack Upgrade.
This is because of the M3UA error "No o Configured AS for ASP”.

1)    The asExhangeMode is set to “singleExchange” at Signalling Gateway while at SGSN side asExhangeMode is set to “doubleExchange”.
2)    Both the nodes are sending ASPUP & ASPUPACK. SG(Signalling Gateway) then sends ASPAC and SGSN responds with ASPAC Ack. SGSN sends ASPAC but SG doesn’t respond with ASPAC Ack and instead it sends error message “ No Configured AS for ASP”.

We need to investigate why SG is not responding with ASPAC Ack message and instead sending Error message towards  SGSN. 
Can this be a configuration issue ?Or a bug ?The same configuration was working before the Trillium upgrade.
Is it proper to have one node in single exchange mode while the other as double exchange ?
Is the error being thrown for no routing context in the ASP AC message ?

Best Regards,
Suchetha

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