Ascom Wireless Solutions (Ascom AB) had the Ascom i75, which they upgraded to SIP in 2007. In the year 2010 with the Ascom i62, they added SDES-sRTP. Still today, this model is sold not only by Ascom but also as Unify OpenStage WL3, Mitel 5624, and innovaphone IP62. In contrast to my other phones, this device cannot be configured via a Web interface but requires computer software for configuration, for example, WinPDM. With that, you can use VoIP/SIP servers like Digium Asterisk or public VoIP/SIP providers. If not specified differently, the navigation path is WinPDM → (tab) Numbers → Menu → Number → Edit parameters.
6.1.0
retested with 6.1.2 (13 Mar 2019)
| Password: | admin/changeme WinPDM → Device → General Administration password |
| HTTPS: | enabled out of the box |
| Update: | WinPDM → (tab) Device → Menu → Device → Upgrade software… |
| Trust Anchors: | WinPDM → (tab) Numbers → Menu → Number → Manage Certificates → (tab) Trust list |
| SIP-URI User: | WinPDM → (tab) Numbers → Menu → Number → New… or Rename… → (Call) number |
| SIP-URI Host: | VoIP → SIP → Primary SIP proxy |
| SIP-over-TLS: | VoIP → SIP → SIP Transport: TLS |
| SDES-sRTP: | VoIP → General → Offer Secure RTP: Yes which is RTP/SAVP + RTP/AVP |
| SHA-2 Digest: | does not pick MD5, continues without header Authorization, therefore is not able to register; therefore incompatible with Linphone |
| DNS-NAPTR: | missing |
| NTP: | allows no domain, just IP address |
| Named Curves: | just P-256, no P-384, or X448; questions its AES-256 sRTP support |
| IP Port Source: | not the actual port but 5060 in the SIP headers Via and Contact Mitigation: unknown; service has to ignore it and re-use the TCP based connection instead |
| Bugs: | DNS-SRV redirection disables Hostname Validation, missing TLS_ECDHE_[RSA|ECDSA]_WITH_AES_128_GCM_SHA256 |
| Responsible Disclosure: | no way found |
| Firmware Update: | missing Automation missing Newsletter |
5 V ?.? A, Desktop Charger (proprietary USB interface)