[Linphone-developers] flickering/unusable UI when accepting calls and "no via in response"

[Noel Kuntze]

Hello list,

For some weeks already, I can't accept or make calls with linphone over sip.
When I receive a call, the UI rapidly flashes between the accepted call UI with 
the mute buttons and so on,
and the UI for accepting the call.
When trying to make a call, linphone never succeeds and eventually the tries 
time out.
linphone logs the following:

message: 2017-09-22 00:07:25:331 [org.antlr.runtime.MismatchedTokenException]  
reason [1311:1: via_params : ( via_received[$header_via::current] | 
generic_param[BELLE_SIP_PARAMETERS($header_via::current)] );]
error: 2017-09-22 00:07:25:331 header_via parser error for [Via:SIP/2.0/UDP 
[2a02:8071:9288:7d00:84c8:d3a1:9b8d:d79e]:5060;branch=z9hG4bK.F90ImGUMC;rport=5060;received=[2a02:8071:9288:7d00:84c8:d3a1:9b8d:d79e]]
message: 2017-09-22 00:07:25:331 channel [0x55f2939c7d80] [418] bytes parsed
error: 2017-09-22 00:07:25:331 channel [0x55f2939c7d80]: no via in response.
warning: 2017-09-22 00:07:25:331 Response has no via.
warning: 2017-09-22 00:07:25:331 Discarding stateless response [401]

The messages have a Via header, though. It looks like this:
Via: SIP/2.0/UDP 
[2a02:8071:9288:7d00:84c8:d3a1:9b8d:d79e]:5060;branch=z9hG4bK.F90ImGUMC;rport


linphone tries to retransmit the packets all the time. It never succeeds, 
because the parsing of every response fails with the errors above.

OS: Arch Linux
Version: 3.11.1

Kind regards

Noel Kuntze

-- 
Noel Kuntze
IT security consultant

GPG Key ID: 0x0739AD6C
Fingerprint: 3524 93BE B5F7 8E63 1372 AF2D F54E E40B 0739 AD6C

0x0739AD6C.asc
Description: application/pgp-keys

signature.asc
Description: OpenPGP digital signature