SPA303 - Reordering the position of Content-Length header in SIP INVITE

Hi,
I have SPA303 IP Phone connected behind a SIP ALG router but have been facing issues with media setup for incoming and outgoing calls.
Further investigation using SIPp script helped me out to understand the root cause of the issue which is as follows:
If the SIP INVITE or 200 OK for SIP INVITE has Content-Length header ahead of the Content-Type header, the SIP ALG router is not able to handle the RTP traffic for the calls. Cisco SPA303 IP phone exhibits this behaviour and hence couldn't successfully establish call with the SIP ALG that I use.
Can you please confirm if it is configurable to reposition or re-order the Content-Length header to resolve this issue?
Thanks in advance.
Regards,
Anand Krishnan

As far as I know it's not configurable. According SIP protocol, the order of SIP headers is not meaningfull.
Your router need to accept both orders as both are corrrect and have same meaning. Ask the vendor of router for updated firmware ...

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SPA303 - Reordering the position of Content-Length header in SIP INVITE

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