ice-pwd is too short, RFC5245 need at least 128 bits of randomness

[Morgan Chen <jacksonchenjp@xxxxxxxxxxx>]

Hi, PJSIP experts, 

I am new to PJSIP, now I am trying to make call using SIP to WebRTC. 

I am using MicroSIP to simulate SIP client, and using latest Chrome/Firefox for WebRTC side. 

>From PJSIP Datasheet page, https://trac.pjsip.org/repos/wiki/PJSIP-Datasheet

PJSIP should support ICE protocol RFC5245 (https://tools.ietf.org/pdf/rfc5245.pdf  )

And from RFC 5245 Page 76(section 15.4: "ice-ufrag" and "ice-pwd" Attributes) 

   The ice-ufrag and ice-pwd attributes MUST be chosen randomly at the

beginning of a session. The ice-ufrag attribute MUST contain at

least 24 bits of randomness, and the ice-pwd attribute MUST contain

at least 128 bits of randomness.

But from captured packet in Wireshark, the length "ice-pwd" generated in pjmedia is less than 128 bits,  only 8 char actually, refer to attached screenshot for details. 

Also from this page, https://trac.pjsip.org/repos/wiki/Using_Standalone_ICE

The sample ic-pwd is just 8 char. 

a=ice-ufrag:2b2c6196 
a=ice-pwd:06ea0fa8 

Because ice-pwd is too short here, the browser side rejected this. 

Anyone can help to explain this ?

Appreciate your support in advance. 

Happy New Year.

Jackson

Attachment: ice-pwd-length.jpg
Description: ice-pwd-length.jpg

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