[Serusers] sequential forking and merged request

Hello, I have a question about sequential forking and Merged Request. If in a forking SER calls two lines of the same client (different numbers and different Request-URIs) it refuses the second call with 482 (Cisco and Snom multiline phone for example) according with RFC 3261 section 8.2.2.2 because the two INVITEs have the same Call-Id, From tag and Cseq. If this behaviour is reasonable with a phone, it could not be acceptable for other types of client, first of all SIP-PSTN gateway. Is it correct this RFC interpretation? Maybe is this section inappropriate for gateways? Is there something that I can do in the config file? ********************************************************************** The information in this message is confidential and may be legally privileged. It is intended solely for the addressee. Access to this message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, or distribution of the message, or any action or omission taken by you in reliance on it, is prohibited and may be unlawful. Please immediately contact the sender if you have received this message inerror. **********************************************************************