Reg: Error while placing a call

Hi guys,
I am using asterisk 11, in which using WebRtc and SRTP developed a small webpage that will register an extension and can make a call. While a making a call the destinated extension get a call but
on attending the call, i am getting a buzzing sound alone. in asterisk side its throwing error like
"[May 7 17:20:39] ERROR[28979][C-00000000]: netsock2.c:269 ast_sockaddr_resolve: getaddrinfo(“df7jal23ls0d.invalid”, “(null)”, …): Name or service not known
[May 7 17:20:39] WARNING[28979][C-00000000]: chan_sip.c:15894 __set_address_from_contact: Invalid host name in Contact: (can’t resolve in DNS) : ‘df7jal23ls0d.invalid’"

and in some cases the following type of error also happens
"[May 22 11:48:08] NOTICE[3376]: chan_sip.c:23476 handle_response_peerpoke: Peer ‘1062’ is now Reachable. (198ms / 2000ms)
[May 22 11:48:23] NOTICE[3380][C-00000000]: pbx.c:4692 pbx_extension_helper: No such label ‘stdexten’ in extension ‘1061’ in context ‘default’
[May 22 11:48:23] WARNING[3380][C-00000000]: pbx.c:12075 pbx_parseable_goto: Priority ‘stdexten’ must be a number > 0, or valid label
[May 22 11:48:23] ERROR[3380][C-00000000]: app_stack.c:547 gosub_exec: Gosub address is invalid: ‘1061,stdexten(SIP/1061)’"

does anyone faces the same scenario.

Thanks in advance

Looks like a malformed SIP header. You need to provide the contents of the SIP packet.