It was noitced "branch=0" in sip-pinging requests, that seems not RFC compliant:

OPTIONS sip:0004*202@192.168.5.61:5062 SIP/2.0. Via: SIP/2.0/UDP xxx.xxx.xxx.xxx:5060;branch=0. From: sip:ping@myhost.ru;tag=uloc-5756b445-45e2-53b-223ff654-6ad81121. To: sip:0004*202@192.168.5.61:5062. Call-ID: 935a5981-9d632e71-c6c3075@xxx.xxx.xxx.xxx. CSeq: 1 OPTIONS. Content-Length: 0.

this issue is a google search result: https://github.com/OpenSIPS/opensips/issues/145 so this patch is just a copy of [varunvairavan](https://github.com/varunvairavan) patch You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/686

-- Commit Summary --

* nathelper: set via branch according to "z9hG4bK..." format (instead of "branch=0") * nat_traversal: set via branch according to "z9hG4bK..." format (instead of "branch=0")

-- File Changes --

M modules/nat_traversal/nat_traversal.c (5) M modules/nathelper/sip_pinger.h (16)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/686.patch https://github.com/kamailio/kamailio/pull/686.diff

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