[OpenSIPS-Users] Repeated INVITEs and nonce expiration time

microx acmicrox at gmail.com
Mon Sep 2 08:21:28 CEST 2013

Hi all,

In my environment, there are one outbound proxy and one internal SIP server.
The outbound proxy is an interface exposed to SIP clients and the internal
SIP server is the one handling registration and making calls for SIP
clients. For Apple's APNS service, one scenario must be supported in my
environment (refer to my previous thread

The scenario is that the outbound proxy will repeatedly send INVITEs to the
SIP server on behalf of the caller before the callee has registered
successfully. During the process, the SIP server "sometimes" thinks the
repeated INVITEs with stale nonce and asks for authentication again. Since
the repeated INVITEs are sent in less than 10 seconds after the first
INVITE, the nonce should remain valid (the default nonce_expire_time is 30
seconds in OpenSIPS). Has anyone encountered the same issue? Any help is
greatly appreciated.

Best regards,

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