this is the VoiP no coming to you, routed by , some misc VoiP provider which don't have voip or ITSP license, they send the confrence ID, in the cli no field, previously this ID used to be anywere between 4 to 6 digit, now as mobile co dosn't provide POI to them (because of pressure form TRAI), they shifted it to 10 digit, now the telecom co in india when receive a CLI without +(contery code) they prefix +91 in it.
they do it because they also route there isd calls through VoiP (with the concenses of TRI), to save on money.
anyway if you receive a call with
either
80,85, +80,+85,9180,+9185, with ending 0 or 2 , and if there is no return path, that is a voip call.
and at the last we have to live with it as the the peoples forwarding the call to the mobile co's POI is also providing that co the POI in that country were the call is routed from.
and that lamba sannata is due to some mis configured the voip device for testing.
in us and uk people have these kind of call on regular basis, thanks to small call centers in india, pakistan, philipeens etc, were some people is either configuring or customizing the dialers from the leads(no's) provided by us/uk provider and dialing that no, or some misbehaving dialer were the rx and tx packets becomes one way or the levels are drop down too much.