The only reliable way to solve such problems is to analyze the SIP signaling on VSP side. Without seeing the SIP messages people can only guess.
Troubleshooting problems with Nokia it's necessary to keep in mind a few things:
- Nokia will use STUN automatically, but this may be changed from Nokia VoIP Settings application; depending on NAT device STUN usage may create a problem
- Nokia will always use source port 5060, if another SIP UA behind the same NAT router will use the same port this may create a problem
- Nokia creating INVITE message of quite a big size; this may create a problem with outgoing calls from it through SIP proxy, but this should not be a problem in Voxalot case (as Voxalot is running Asterisk which is B2B UA and not a SIP proxy); disabling codecs and switching to compact headers will not dramatically decrease the size;
- some Nokia models have SIP identity (From: field) hidden by default, this should be changed,
http://forum.voxalot.com/voxalot-sup...html#post22139