[MMUSIC] STUN/ICE: Username length inconstency

[Rémi Denis-Courmont <remi.denis-courmont at nokia.com>]

	Hello,

It seems there is a minor error in the maximum username length between ICE-17 
and RFC3489bis-09.

STUN says USERNAME are at most 127 Unicode code points. There is no way a ICE 
user fragment of 1024 bytes could fit in there. I would assume the ICE ufrag 
should be limited to (127-1)/2 = 63 characters, so that the resulting STUN 
username is always within the 127 code points limits, including one code 
point for the semi-colon.

In any case, an ICE implemention that fails to obey this limit would fail to 
interoperate with another instance of itself, which is pretty lame :)
Also, it ensures the ICE connectivity check packets size remain within the 
minimum IPv4 MTU.

I hope, that I either misunderstood something, or that this is a minor enough 
change that it can still be done this late in the process.

-- 
Rémi Denis-Courmont

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