[Spce-user] SIP-Response INJECTION

[Klaus Peter v. Friedeburg]

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?

I named this "SIP injection" while the server is "injecting" an answer wich is not generated by the CPE

          Klaus Peter