Pierre-Luc Bacon schrieb: > I think that we are facing a dilemma here. > > Digressing the RFC would make PJSIP to work properly in this case (which > might appear with a lot more VOIP providers doing load balancing). > > However, leaving it untouched makes the matter way more complex to deal > with in the application. A possible workaround and maybe the only one I > see, would be to resolve the host name initially, and use that IP from > the moment the user launched the application to the end. Not so > pretty ... > > I'm not familiar with SIP load balancing but should a "good" load > balancer infrastructure be able to forward 407 challenges among > themselves ? That way, a server which didn't send that challenge > initially can answer back properly to that new REGISTER. I think it really depends on the used software and configuration. E.g. if you use openser, you can configure it to allow nonce_reuse. Then, the nonce is calculated stateless in all openser instances identical and any proxy acecpts a nonce which was generated by another proxy. Probably if a SIP proxy calculates the nonce stateful and does not share the nonce between the various proxies, it does not work. regards klaus
