Symptom
In one South Africa office where the eSpace U1930 is used, the customer, by analyzing Internet service provider (ISP) call logs, finds that the eSpace U1930 does not perform any operations when receiving INVITE messages with the empty calling number from the ISP. As a result, a large number of similar calls fail to be connected.
Possible Cause
Based on the UCMaint logs captured on the eSpace U1930, the eSpace U1930 does not process the INVITE message received from the ISP or return the 100 trying message, resulting in a call connection failure. The INVITE message received by the eSpace U1930 is as follows:
INVITE sip:27117159000@192.1**.**.15:5060 SIP/2.0 Via: SIP/2.0/UDP 41.**.**.220:5060;branch=z9hG4bKanomi9000og1ll042080.1 P-Asserted-Identity: Anonymous <sip:10.**.**.4@41.**.**.145> h323-conf-id: 1434894174-3020831274-3055019666-2148325140 From: Anonymous <sip:41.**.**.145>;tag=h5pbr6kuuu5d2bdg.o Content-disposition: session Expires: 300 User-Agent: Sippy To: <sip:27117159000@10.**.**.220> Remote-Party-ID: Anonymous <sip:10.**.**.4@41.**.**.145>;party=calling Contact: Anonymous <sip:41.**.**.220:5060;transport=udp> CSeq: 409 INVITE cisco-GUID: 1434894174-3020831274-3055019666-2148325140 Max-Forwards: 69 Call-ID:BW115329348210613-518645148@196.**.**.5 Content-Length: 286 Content-Type: application/sdp v=0 o=Sippy 27610256 0 IN IP4 41.**.**.220 s=- t=0 0 m=audio 30086 RTP/AVP 4 18 101 c=IN IP4 41.**.**.220 a=rtpmap:4 G723/8000 a=rtpmap:18 G729/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=fmtp:18 annexb=yes a=bsoft: 1
For an anonymous call, the From header must be in the following standard format:
From: <sip:Anonymous@192.**.**.5;user=phone>;tag= xxx (Anonymous can be replaced with other words.)
The From header in the INVITE message is as follows:
From: Anonymous <sip:41.**.**.145>;tag=h5pbr6kuuu5d2bdg.o
The calling number is empty, which is not in the standard format. As a result, the eSpace U1930 cannot process the INVITE message.
Solution
This fault occurs because the format of INVITE messages sent by the ISP is invalid. Contact the ISP to correct the format.
