[SIPForum-discussion] "100 REL" vs "100 rel"

nitin kapoor nitinkapoorr at gmail.com
Sat May 30 02:21:01 UTC 2009

Hello Chesser,

There is no OPTION Tag with the name of 100REL, there is only OPTION Tag
with the name of "*100rel*" and we are using this option tag is for
reliability of provisional responses.  When present in a Supported header,
it indicates that the UA can send or receive reliable provisional
responses.When present in a Require header in a request, it indicates that
the UAS MUST send all provisional responses reliably.When present in a
Require header in a reliable provisional response, it indicates that the
response is to be sent reliably.

Please refer to rfc 3261 and 3262 for more info.

Nitin Kapoor
General Telecom

2009/5/28 chesser domingo <chesnet at yahoo.com>

> Hello to everybody...
> Kindly help me with the difference between "100 REL" and "100 rel".
> We have a ZTE ZXSS SS1a/b soft switch and a SIP trunk interconnection with
> a Nortel CS1000 PBX. On the SUPPORTED header of the Invite from ZTE, it
> places "100 REL". On the other hand, the supported header from the Nortel
> CS1000 indicates a "100 rel". IS there a chance that the ZTE soft switch
> does not accept the "100 rel" from the Nortel PBX?
> Kind Regards,
> Chesser Domingo
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