[Spce-user] SIP-Response INJECTION

Jon Bonilla (Manwe) jbonilla at sipwise.com
Tue Nov 20 16:31:30 EST 2012

El Tue, 20 Nov 2012 21:27:57 +0100
"Klaus Peter v. Friedeburg" <friedeburg at aco.de> escribió:

> Hi,
> I have an other (new) problem:
> Some kind of CPE's (Zyxel) don’t answer correctly if they received an SIP-181
> with setting "Require: 100rel". The CPE should answer with PRACK but they do
> not so. Is there any solution to "manipulate" the SIP-Session in NGCP, so
> that NGCP send the PRACK instead of the CPE?

Is something wrong in the negotiation? Do they send PRACK in the supported

Can you send a ngrep example?

We could maybe filter the method negotiation in the sbc, or remove the 100rel
in the supported or required headers. But depends on the peer too. And it's a
dirty thing.

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