[SR-Users] kamailio SBC - session timers
marek
cervajs64 at gmail.com
Tue Sep 29 13:05:12 CEST 2020
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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