I’ve been tearing my hair out trying to get a Polycom phone (behind a NAT) to 
register to an * box behind a Cisco SIP ALG.  With known good credentials 
configured on the phone and in *, I get 403 Bad Auth when trying to register.  
If I put the phone onto the same LAN as * it works fine without changing any 
authentication parameters whatsoever.  If I make the secret blank (null) on the 
phone and *, it’s registers fine.  An X-Lite softphone works fine, and I 
already have a Cisco 7960 working in the same scenario but no go with the 
Polycom (I’ve tried a few different firmware versions, currently up to 2.02).

 

I also have configured Polycoms behind NAT to configure to * that is not behind 
a SIP ALG many times without trouble…it’s just with the SIP ALG that I’ve hit 
this wall…

 

I found this forum thread which seems to pinpoint the issue, but I’m not really 
understanding the suggested fix. Does anyone out there understand the MD5 
challenge/response and URI stuff that can give me some clue what to do?

 

HYPERLINK 
"http://forum.voxilla.com/asterisk-support-forum/sipura-asterisk-registration-failed-wrong-password-18730.html"http://forum.voxilla.com/asterisk-support-forum/sipura-asterisk-registration-failed-wrong-password-18730.html

 

 

Thanks!

 

mmastera

 


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