We have a number of Cisco desk phones on a 3rd Party Asterix SIP provider, these have been manually registered. They hold registration and can dial out OK. Inbound calls connect for 10 mins but then callers cannot get through unless registration is refreshed. relevant settings changed as below.
<NAT_Keep_Alive_Enable_1_ ua="na">Yes</NAT_Keep_Alive_Enable_1_>
<NAT_Keep_Alive_Msg_1_ ua="na"></NAT_Keep_Alive_Msg_1_>
<Resync_Random_Delay ua="na">6000</Resync_Random_Delay>
<Sticky_183_1_ ua="na">Yes</Sticky_183_1_>
