Añado información con trazas TCPDUMP 08:47:04.298563 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 772)
192.168.1.43.5060 > 10.31.255.134.5070: [udp sum ok] SIP, length: 744
REGISTER sip:telefonica.net:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.43:5060;branch=z9hG4bKbb5442fdd909718bc
Route: <sip:10.31.255.134:5070;lr>
Max-Forwards: 70
From: "91XXXXXXX" <sip:91XXXXXXX@10.31.255.134:5070>;tag=a43eee1c96
To: "91XXXXXXX" <sip:91XXXXXXX@10.31.255.134:5070>
Call-ID: ad2502463fc32523
CSeq: 1101123348 REGISTER
Accept-Language: en
Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, OPTIONS, UPDATE, PRACK, SUBSCRIBE, INFO, PUBLISH
Allow-Events: talk, hold, conference, LocalModeStatus
Contact: "91XXXXXXX" <sip:91XXXXXXX@192.168.1.43:5060;transport=udp>;+sip.instance=""
Supported: path, gruu
User-Agent: Aastra 6865i/5.0.0.1018
Aastra-Line: 1
Content-Length: 0
08:47:04.383009 IP (tos 0x28, ttl 123, id 0, offset 0, flags [none], proto UDP (17), length 397)
10.31.255.134.5070 > 192.168.1.43.5060: [udp sum ok] SIP, length: 369
SIP/2.0 403 Forbidden 110200201005001
Via: SIP/2.0/UDP 192.168.1.43:5060;received=10.25.248.138;branch=z9hG4bKbb5442fdd909718bc;rport=5060
From: "91XXXXXXX" <sip:91XXXXXXX@10.31.255.134:5070>;tag=a43eee1c96
To: "91XXXXXXX" <sip:91XXXXXXX@10.31.255.134:5070>;tag=c3ec2bb208b6e0621fa974f5383
Call-ID: ad2502463fc32523
CSeq: 1101123348 REGISTER
Content-Length: 0
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