Ранее стояло железо 2004S. Все отлично работало, пока не сдохло. Купил 5004S. Вроде и настройки правильные, но не регистрируется на сипнете. На Сипнетовском форуме аналогичную тему уже 2 раза прибивали - добрые они.
У кого 5004S c SIPNETом работает - посмотрите - где я в настройках накосячил:
Лист закладки General Settings/SIP в WEB UI:

Line - [1/2/3/4]
Type - [FXS/FXS/FXS/FXS]
Number - [xxxxxxx/xxxxxxx/xxxxxxx/xxxxxxx]
Register - [YES/YES/YES/YES]
Invite with ID / Account - [YES/YES/YES/YES]
User ID / Account - [xxxxxxx/xxxxxxx/xxxxxxx/xxxxxxx]
Password - [.../.../.../...]

Use DNS SRV - [YES]
DNS SRV Auto Prefix - [YES]
Proxy Fallback Interval (0-10800s) - [5]

Enable Support of SIP Proxy Server / Soft Switch - [NO]

Enable SIP Proxy 1 - [YES]
Proxy Server IP / Domain - [sipnet.ru]
Proxy Server Port (1-65535) - [5060]
Proxy Server Realm - []
TTL (Registration interval) (10-7200 s) - [20]
SIP Domain - [sipnet.ru]
Use Domain to Register - [YES]
Enable SIP Proxy 2 - [NO]
Proxy Server IP / Domain - []
Proxy Server Port (1-65535) - []
Proxy Server Realm - []
TTL (Registration interval) (10-7200 s) - []
SIP Domain - []
Use Domain to Register - [NO]

VoIP failure announcement - [NO]
Bind Proxy Interval for NAT (0-1800s) [0]
Initial Unregister - [NO]
Support Message Waiting Indication (MWI) - [NO]
MWI Subscribe Interval (0=disable, 60-86400s) - [7200]

Outbond Proxy Support - [NO]
Outbond Proxy IP/Domain - []
Outbond Proxy port [1-65536] - [5060]

Session Expiration (0=disable, 10-1800s) - [60]
Session Refresh Request (UPDATE/Re-INVITE) - [re-INVITE]
Session Refresher (UAS/UAC) - [UAS]

Enable P-Asserted - [NO]
Privacy Type - [id]

SIP Message Resend Timer Base (s) - [0.5]
Max. Response Time for Invite (1-32) - [8]
Invite URL need 'user=phone' - [YES]
Realibility of Provisional Responses - [NO]
Compact Form - [NO]
SIP Caller ID Obtaining - [Remote-Party-ID Display Name]
Put Caller ID In URI - [NO]
INVITE With Remote-Party-ID Header - [No]
Support URI Percent-Encoding (RFC 3986) - [NO]
Enable SIP 'Allow' Header - [YES]
Call Hold Compatible With RFC 2543 - [YES]
Enable SDP 'ptime' Attribute - [NO]

International Call Prefix Digit - []
Country Code - [7 (Russia)] []
Long Distance Call Prefix Digit - []
Area Code - []

E.164 Numbering / To Invite Proxy - [NO]
E.164 Numbering / Transform to Transit Out - [NO]
ENUM Header Exception - [070]

Enable Support of SIP Proxy Server / Soft Switch - должно быть yes

SIP Domain - [sipnet.ru]

Enable Support of SIP Proxy Server / Soft Switch - должно быть yes

Спасибо!!!!!