[SR-Users] kamailio SBC - session timers

[Jan Rozhon]

Hi,

this might be a long shot but perhaps sdpops module could help you out
with the problem. Have you tried it?

Regards, Jan

On 29. 09. 20 13:05, marek wrote:
>
> hi,
>
> i have kamailio+rtpengine acting as a SBC (private/public net interfaces)
>
> kamailio 5.4.x/rtpengine 9.x/centos 7
>
> using TOPOH module
>
> modparam("topoh", "mask_ip", "public_IP")
>
> i'm rewriting IPs in INVITE like this
>
>  $var(ruri) = "sip:" + $(ru{re.subst,/private_IP/public_IP/g});
>                 $ru = $(ru{re.subst,/private_IP/public_IP/g});
>                 $tu = $(tu{re.subst,/private_IP/public_IP/g});
>                 $fu = $(fu{re.subst,/remote_private_IP/public_IP/g});
> the same for route[WITHINDIALOG] and INVITE
>
>
> i have problem with session timers using re-INVITE method
>
> in the first INVITE SDP is correct
>
> c=IN IP4 public_IP
>
> but
>
> in the reinvite is
>
> c=IN IP4 private_IP
>
> and remote SBC drop with 422 because SDP is changed and SDP version is
> not.
>
> any tips / best practice?
>
> thanks
>
> Marek
>
>
>
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