Unable to establish call. 'INVITE' not implemented (501 response)

[rick]

Hi,

When try to call a number from a conference call provider, it is stuck on TRYING. The call is never established. In the logs I see this:

<-------------------- SIP/2.0 100 Trying
from: xxxxxxx
to: xxxxxxx
time: 1501228599418
timeStamp:
isSender: false
transactionId: z9hg4bkec54afd944bd4a0dbf6885e7fe52760f
callId: 3b4dc508-65c5-428b-8ed3-804c993af531

SIP/2.0 100 Trying
Via: SIP/2.0/UDP 52.212.73.0:30001;branch=z9hG4bKec54afd944bd4a0dbf6885e7fe52760f;received=52.212.73.0
From: xxxxxxx
To: xxxxxxx
Call-ID: 3b4dc508-65c5-428b-8ed3-804c993af531
CSeq: 1 INVITE
Server: 12Connect VPBX
Allow: INVITE,ACK,CANCEL,OPTIONS,BYE,REFER,SUBSCRIBE,NOTIFY,INFO,PUBLISH
Supported: replaces,timer
Session-Expires: 1800;refresher=uac
Contact: <sip:0207168427@109.71.104.36:5060>
Content-Length: 0


07:56:39,423 DEBUG sipMessages - UDPMessageChannelThread-30001-84

<-------------------- SIP/2.0 501 Not Implemented
from: xxxxxxx
to: xxxxxxx
time: 1501228599422
timeStamp:
isSender: false
transactionId: z9hg4bkec54afd944bd4a0dbf6885e7fe52760f
callId: 3b4dc508-65c5-428b-8ed3-804c993af531

SIP/2.0 501 Not Implemented
Via: SIP/2.0/UDP 52.212.73.0:30001;branch=z9hG4bKec54afd944bd4a0dbf6885e7fe52760f;received=52.212.73.0
From: xxxxxxx
To: xxxxxxx
Call-ID: 3b4dc508-65c5-428b-8ed3-804c993af531
CSeq: 1 INVITE
Server: 12Connect VPBX
Allow: INVITE,ACK,CANCEL,OPTIONS,BYE,REFER,SUBSCRIBE,NOTIFY,INFO,PUBLISH
Supported: replaces,timer
Content-Length: 0


07:56:39,423 DEBUG sipMessages - UDPMessageChannelThread-30001-84

--------------------> ACK sip:0207168427@tel.12connect.com SIP/2.0
from: xxxxxxx
to: xxxxxxx
time: 1501228599423
timeStamp:
isSender: true
transactionId: z9hg4bkec54afd944bd4a0dbf6885e7fe52760f
callId: 3b4dc508-65c5-428b-8ed3-804c993af531

ACK sip:0207168427@tel.12connect.com SIP/2.0
Call-ID: 3b4dc508-65c5-428b-8ed3-804c993af531
Max-Forwards: 70
From: xxxxxxx
To: xxxxxxx
Via: SIP/2.0/UDP 52.212.73.0:30001;branch=z9hG4bKec54afd944bd4a0dbf6885e7fe52760f
CSeq: 1 ACK
Content-Length: 0


07:56:39,426 INFO WCS4CallbackHandler - pool-1-thread-5 notifyBalance 999236769@tel.12connect.com
07:56:39,427 INFO ManagerApiConnection - pool-1-thread-5 Config for method CallStatusEvent not found, using defaults
07:56:39,464 WARN allResponseProcessor - pool-1-thread-6 Method 'INVITE' not implemented (501 response)


Can anyone give me some insight on this error? Is it an issue in the webcallserver itself or can I do something about it on my end?

Thanks in advance

 

[Max]

Hi
From your log
1. WCS sends INVITE request
2. SIP endpoint 12Connect VPBX sends response 501 Not implemented

21.5.2 501 Not Implemented

The server does not support the functionality required to fulfill the
request. This is the appropriate response when a UAS does not
recognize the request method and is not capable of supporting it for
any user. (Proxies forward all requests regardless of method.)

https://tools.ietf.org/html/rfc3261#section-21.5.2

Make sure your SIP endpoint accepts calls from a softphone like Xlite, Linphone, etc.
If it works, please send SIP credentials to logs@flashphoner.com. We will test.